1 /* Build expressions with type checking for C++ compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 /* This file is part of the C++ front end.
25 It contains routines to build C++ expressions given their operands,
26 including computing the types of the result, C and C++ specific error
27 checks, and some optimization.
29 There are also routines to build RETURN_STMT nodes and CASE_STMT nodes,
30 and to process initializations in declarations (since they work
31 like a strange sort of assignment). */
35 #include "coretypes.h"
45 #include "diagnostic.h"
49 static tree convert_for_assignment (tree, tree, const char *, tree, int);
50 static tree cp_pointer_int_sum (enum tree_code, tree, tree);
51 static tree rationalize_conditional_expr (enum tree_code, tree);
52 static int comp_ptr_ttypes_real (tree, tree, int);
53 static int comp_ptr_ttypes_const (tree, tree);
54 static bool comp_except_types (tree, tree, bool);
55 static bool comp_array_types (tree, tree, bool);
56 static tree common_base_type (tree, tree);
57 static tree lookup_anon_field (tree, tree);
58 static tree pointer_diff (tree, tree, tree);
59 static tree get_delta_difference (tree, tree, int);
60 static void casts_away_constness_r (tree *, tree *);
61 static bool casts_away_constness (tree, tree);
62 static void maybe_warn_about_returning_address_of_local (tree);
63 static tree lookup_destructor (tree, tree, tree);
65 /* Return the target type of TYPE, which means return T for:
66 T*, T&, T[], T (...), and otherwise, just T. */
69 target_type (tree type)
71 type = non_reference (type);
72 while (TREE_CODE (type) == POINTER_TYPE
73 || TREE_CODE (type) == ARRAY_TYPE
74 || TREE_CODE (type) == FUNCTION_TYPE
75 || TREE_CODE (type) == METHOD_TYPE
76 || TYPE_PTRMEM_P (type))
77 type = TREE_TYPE (type);
81 /* Do `exp = require_complete_type (exp);' to make sure exp
82 does not have an incomplete type. (That includes void types.)
83 Returns the error_mark_node if the VALUE does not have
84 complete type when this function returns. */
87 require_complete_type (tree value)
91 if (processing_template_decl || value == error_mark_node)
94 if (TREE_CODE (value) == OVERLOAD)
95 type = unknown_type_node;
97 type = TREE_TYPE (value);
99 /* First, detect a valid value with a complete type. */
100 if (COMPLETE_TYPE_P (type))
103 if (complete_type_or_else (type, value))
106 return error_mark_node;
109 /* Try to complete TYPE, if it is incomplete. For example, if TYPE is
110 a template instantiation, do the instantiation. Returns TYPE,
111 whether or not it could be completed, unless something goes
112 horribly wrong, in which case the error_mark_node is returned. */
115 complete_type (tree type)
117 if (type == NULL_TREE)
118 /* Rather than crash, we return something sure to cause an error
120 return error_mark_node;
122 if (type == error_mark_node || COMPLETE_TYPE_P (type))
124 else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type))
126 tree t = complete_type (TREE_TYPE (type));
127 if (COMPLETE_TYPE_P (t) && ! processing_template_decl)
129 TYPE_NEEDS_CONSTRUCTING (type)
130 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t));
131 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
132 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (t));
134 else if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type))
135 instantiate_class_template (TYPE_MAIN_VARIANT (type));
140 /* Like complete_type, but issue an error if the TYPE cannot be completed.
141 VALUE is used for informative diagnostics. DIAG_TYPE indicates the type
142 of diagnostic: 0 for an error, 1 for a warning, 2 for a pedwarn.
143 Returns NULL_TREE if the type cannot be made complete. */
146 complete_type_or_diagnostic (tree type, tree value, int diag_type)
148 type = complete_type (type);
149 if (type == error_mark_node)
150 /* We already issued an error. */
152 else if (!COMPLETE_TYPE_P (type))
154 cxx_incomplete_type_diagnostic (value, type, diag_type);
161 /* Return truthvalue of whether type of EXP is instantiated. */
164 type_unknown_p (tree exp)
166 return (TREE_CODE (exp) == OVERLOAD
167 || TREE_CODE (exp) == TREE_LIST
168 || TREE_TYPE (exp) == unknown_type_node);
172 /* Return the common type of two parameter lists.
173 We assume that comptypes has already been done and returned 1;
174 if that isn't so, this may crash.
176 As an optimization, free the space we allocate if the parameter
177 lists are already common. */
180 commonparms (tree p1, tree p2)
182 tree oldargs = p1, newargs, n;
186 len = list_length (p1);
187 newargs = tree_last (p1);
189 if (newargs == void_list_node)
198 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
203 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++)
205 if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2))
207 TREE_PURPOSE (n) = TREE_PURPOSE (p1);
210 else if (! TREE_PURPOSE (p1))
212 if (TREE_PURPOSE (p2))
214 TREE_PURPOSE (n) = TREE_PURPOSE (p2);
220 if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2)))
222 TREE_PURPOSE (n) = TREE_PURPOSE (p2);
224 if (TREE_VALUE (p1) != TREE_VALUE (p2))
227 TREE_VALUE (n) = merge_types (TREE_VALUE (p1), TREE_VALUE (p2));
230 TREE_VALUE (n) = TREE_VALUE (p1);
238 /* Given a type, perhaps copied for a typedef,
239 find the "original" version of it. */
241 original_type (tree t)
243 while (TYPE_NAME (t) != NULL_TREE)
245 tree x = TYPE_NAME (t);
246 if (TREE_CODE (x) != TYPE_DECL)
248 x = DECL_ORIGINAL_TYPE (x);
256 /* T1 and T2 are arithmetic or enumeration types. Return the type
257 that will result from the "usual arithmetic conversions" on T1 and
258 T2 as described in [expr]. */
261 type_after_usual_arithmetic_conversions (tree t1, tree t2)
263 enum tree_code code1 = TREE_CODE (t1);
264 enum tree_code code2 = TREE_CODE (t2);
267 /* FIXME: Attributes. */
268 my_friendly_assert (ARITHMETIC_TYPE_P (t1)
269 || TREE_CODE (t1) == COMPLEX_TYPE
270 || TREE_CODE (t1) == ENUMERAL_TYPE,
272 my_friendly_assert (ARITHMETIC_TYPE_P (t2)
273 || TREE_CODE (t2) == COMPLEX_TYPE
274 || TREE_CODE (t2) == ENUMERAL_TYPE,
277 /* In what follows, we slightly generalize the rules given in [expr] so
278 as to deal with `long long' and `complex'. First, merge the
280 attributes = (*targetm.merge_type_attributes) (t1, t2);
282 /* If one type is complex, form the common type of the non-complex
283 components, then make that complex. Use T1 or T2 if it is the
285 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
287 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
288 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
290 = type_after_usual_arithmetic_conversions (subtype1, subtype2);
292 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
293 return build_type_attribute_variant (t1, attributes);
294 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
295 return build_type_attribute_variant (t2, attributes);
297 return build_type_attribute_variant (build_complex_type (subtype),
301 /* If only one is real, use it as the result. */
302 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
303 return build_type_attribute_variant (t1, attributes);
304 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
305 return build_type_attribute_variant (t2, attributes);
307 /* Perform the integral promotions. */
308 if (code1 != REAL_TYPE)
310 t1 = type_promotes_to (t1);
311 t2 = type_promotes_to (t2);
314 /* Both real or both integers; use the one with greater precision. */
315 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
316 return build_type_attribute_variant (t1, attributes);
317 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
318 return build_type_attribute_variant (t2, attributes);
320 /* The types are the same; no need to do anything fancy. */
321 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
322 return build_type_attribute_variant (t1, attributes);
324 if (code1 != REAL_TYPE)
326 /* If one is a sizetype, use it so size_binop doesn't blow up. */
327 if (TYPE_IS_SIZETYPE (t1) > TYPE_IS_SIZETYPE (t2))
328 return build_type_attribute_variant (t1, attributes);
329 if (TYPE_IS_SIZETYPE (t2) > TYPE_IS_SIZETYPE (t1))
330 return build_type_attribute_variant (t2, attributes);
332 /* If one is unsigned long long, then convert the other to unsigned
334 if (same_type_p (TYPE_MAIN_VARIANT (t1), long_long_unsigned_type_node)
335 || same_type_p (TYPE_MAIN_VARIANT (t2), long_long_unsigned_type_node))
336 return build_type_attribute_variant (long_long_unsigned_type_node,
338 /* If one is a long long, and the other is an unsigned long, and
339 long long can represent all the values of an unsigned long, then
340 convert to a long long. Otherwise, convert to an unsigned long
341 long. Otherwise, if either operand is long long, convert the
344 Since we're here, we know the TYPE_PRECISION is the same;
345 therefore converting to long long cannot represent all the values
346 of an unsigned long, so we choose unsigned long long in that
348 if (same_type_p (TYPE_MAIN_VARIANT (t1), long_long_integer_type_node)
349 || same_type_p (TYPE_MAIN_VARIANT (t2), long_long_integer_type_node))
351 tree t = ((TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
352 ? long_long_unsigned_type_node
353 : long_long_integer_type_node);
354 return build_type_attribute_variant (t, attributes);
357 /* Go through the same procedure, but for longs. */
358 if (same_type_p (TYPE_MAIN_VARIANT (t1), long_unsigned_type_node)
359 || same_type_p (TYPE_MAIN_VARIANT (t2), long_unsigned_type_node))
360 return build_type_attribute_variant (long_unsigned_type_node,
362 if (same_type_p (TYPE_MAIN_VARIANT (t1), long_integer_type_node)
363 || same_type_p (TYPE_MAIN_VARIANT (t2), long_integer_type_node))
365 tree t = ((TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
366 ? long_unsigned_type_node : long_integer_type_node);
367 return build_type_attribute_variant (t, attributes);
369 /* Otherwise prefer the unsigned one. */
370 if (TREE_UNSIGNED (t1))
371 return build_type_attribute_variant (t1, attributes);
373 return build_type_attribute_variant (t2, attributes);
377 if (same_type_p (TYPE_MAIN_VARIANT (t1), long_double_type_node)
378 || same_type_p (TYPE_MAIN_VARIANT (t2), long_double_type_node))
379 return build_type_attribute_variant (long_double_type_node,
381 if (same_type_p (TYPE_MAIN_VARIANT (t1), double_type_node)
382 || same_type_p (TYPE_MAIN_VARIANT (t2), double_type_node))
383 return build_type_attribute_variant (double_type_node,
385 if (same_type_p (TYPE_MAIN_VARIANT (t1), float_type_node)
386 || same_type_p (TYPE_MAIN_VARIANT (t2), float_type_node))
387 return build_type_attribute_variant (float_type_node,
390 /* Two floating-point types whose TYPE_MAIN_VARIANTs are none of
391 the standard C++ floating-point types. Logic earlier in this
392 function has already eliminated the possibility that
393 TYPE_PRECISION (t2) != TYPE_PRECISION (t1), so there's no
394 compelling reason to choose one or the other. */
395 return build_type_attribute_variant (t1, attributes);
399 /* Subroutine of composite_pointer_type to implement the recursive
400 case. See that function for documentation fo the parameters. */
403 composite_pointer_type_r (tree t1, tree t2, const char* location)
410 /* Determine the types pointed to by T1 and T2. */
411 if (TREE_CODE (t1) == POINTER_TYPE)
413 pointee1 = TREE_TYPE (t1);
414 pointee2 = TREE_TYPE (t2);
418 pointee1 = TYPE_PTRMEM_POINTED_TO_TYPE (t1);
419 pointee2 = TYPE_PTRMEM_POINTED_TO_TYPE (t2);
424 Otherwise, the composite pointer type is a pointer type
425 similar (_conv.qual_) to the type of one of the operands,
426 with a cv-qualification signature (_conv.qual_) that is the
427 union of the cv-qualification signatures of the operand
429 if (same_type_ignoring_top_level_qualifiers_p (pointee1, pointee2))
430 result_type = pointee1;
431 else if ((TREE_CODE (pointee1) == POINTER_TYPE
432 && TREE_CODE (pointee2) == POINTER_TYPE)
433 || (TYPE_PTR_TO_MEMBER_P (pointee1)
434 && TYPE_PTR_TO_MEMBER_P (pointee2)))
435 result_type = composite_pointer_type_r (pointee1, pointee2, location);
438 pedwarn ("%s between distinct pointer types `%T' and `%T' "
441 result_type = void_type_node;
443 result_type = cp_build_qualified_type (result_type,
444 (cp_type_quals (pointee1)
445 | cp_type_quals (pointee2)));
446 result_type = build_pointer_type (result_type);
447 /* If the original types were pointers to members, so is the
449 if (TYPE_PTR_TO_MEMBER_P (t1))
451 if (!same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1),
452 TYPE_PTRMEM_CLASS_TYPE (t2)))
453 pedwarn ("%s between distinct pointer types `%T' and `%T' "
456 result_type = build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1),
460 /* Merge the attributes. */
461 attributes = (*targetm.merge_type_attributes) (t1, t2);
462 return build_type_attribute_variant (result_type, attributes);
465 /* Return the composite pointer type (see [expr.rel]) for T1 and T2.
466 ARG1 and ARG2 are the values with those types. The LOCATION is a
467 string describing the current location, in case an error occurs.
469 This routine also implements the computation of a common type for
470 pointers-to-members as per [expr.eq]. */
473 composite_pointer_type (tree t1, tree t2, tree arg1, tree arg2,
474 const char* location)
481 If one operand is a null pointer constant, the composite pointer
482 type is the type of the other operand. */
483 if (null_ptr_cst_p (arg1))
485 if (null_ptr_cst_p (arg2))
492 If one of the operands has type "pointer to cv1 void*", then
493 the other has type "pointer to cv2T", and the composite pointer
494 type is "pointer to cv12 void", where cv12 is the union of cv1
497 If either type is a pointer to void, make sure it is T1. */
498 if (TREE_CODE (t2) == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (t2)))
506 /* Now, if T1 is a pointer to void, merge the qualifiers. */
507 if (TREE_CODE (t1) == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (t1)))
512 if (pedantic && TYPE_PTRFN_P (t2))
513 pedwarn ("ISO C++ forbids %s between pointer of type `void *' and pointer-to-function", location);
515 = cp_build_qualified_type (void_type_node,
516 (cp_type_quals (TREE_TYPE (t1))
517 | cp_type_quals (TREE_TYPE (t2))));
518 result_type = build_pointer_type (result_type);
519 /* Merge the attributes. */
520 attributes = (*targetm.merge_type_attributes) (t1, t2);
521 return build_type_attribute_variant (result_type, attributes);
524 /* [expr.eq] permits the application of a pointer conversion to
525 bring the pointers to a common type. */
526 if (TREE_CODE (t1) == POINTER_TYPE && TREE_CODE (t2) == POINTER_TYPE
527 && CLASS_TYPE_P (TREE_TYPE (t1))
528 && CLASS_TYPE_P (TREE_TYPE (t2))
529 && !same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t1),
532 class1 = TREE_TYPE (t1);
533 class2 = TREE_TYPE (t2);
535 if (DERIVED_FROM_P (class1, class2))
536 t2 = (build_pointer_type
537 (cp_build_qualified_type (class1, TYPE_QUALS (class2))));
538 else if (DERIVED_FROM_P (class2, class1))
539 t1 = (build_pointer_type
540 (cp_build_qualified_type (class2, TYPE_QUALS (class1))));
543 error ("%s between distinct pointer types `%T' and `%T' "
544 "lacks a cast", location, t1, t2);
545 return error_mark_node;
548 /* [expr.eq] permits the application of a pointer-to-member
549 conversion to change the class type of one of the types. */
550 else if (TYPE_PTR_TO_MEMBER_P (t1)
551 && !same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1),
552 TYPE_PTRMEM_CLASS_TYPE (t2)))
554 class1 = TYPE_PTRMEM_CLASS_TYPE (t1);
555 class2 = TYPE_PTRMEM_CLASS_TYPE (t2);
557 if (DERIVED_FROM_P (class1, class2))
558 t1 = build_ptrmem_type (class2, TYPE_PTRMEM_POINTED_TO_TYPE (t1));
559 else if (DERIVED_FROM_P (class2, class1))
560 t2 = build_ptrmem_type (class1, TYPE_PTRMEM_POINTED_TO_TYPE (t2));
563 error ("%s between distinct pointer-to-member types `%T' and `%T' "
564 "lacks a cast", location, t1, t2);
565 return error_mark_node;
569 return composite_pointer_type_r (t1, t2, location);
572 /* Return the merged type of two types.
573 We assume that comptypes has already been done and returned 1;
574 if that isn't so, this may crash.
576 This just combines attributes and default arguments; any other
577 differences would cause the two types to compare unalike. */
580 merge_types (tree t1, tree t2)
582 register enum tree_code code1;
583 register enum tree_code code2;
586 /* Save time if the two types are the same. */
589 if (original_type (t1) == original_type (t2))
592 /* If one type is nonsense, use the other. */
593 if (t1 == error_mark_node)
595 if (t2 == error_mark_node)
598 /* Merge the attributes. */
599 attributes = (*targetm.merge_type_attributes) (t1, t2);
601 if (TYPE_PTRMEMFUNC_P (t1))
602 t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1);
603 if (TYPE_PTRMEMFUNC_P (t2))
604 t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2);
606 code1 = TREE_CODE (t1);
607 code2 = TREE_CODE (t2);
613 /* For two pointers, do this recursively on the target type. */
615 tree target = merge_types (TREE_TYPE (t1), TREE_TYPE (t2));
616 int quals = cp_type_quals (t1);
618 if (code1 == POINTER_TYPE)
619 t1 = build_pointer_type (target);
621 t1 = build_reference_type (target);
622 t1 = build_type_attribute_variant (t1, attributes);
623 t1 = cp_build_qualified_type (t1, quals);
625 if (TREE_CODE (target) == METHOD_TYPE)
626 t1 = build_ptrmemfunc_type (t1);
635 quals = cp_type_quals (t1);
636 pointee = merge_types (TYPE_PTRMEM_POINTED_TO_TYPE (t1),
637 TYPE_PTRMEM_POINTED_TO_TYPE (t2));
638 t1 = build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1),
640 t1 = cp_build_qualified_type (t1, quals);
646 tree elt = merge_types (TREE_TYPE (t1), TREE_TYPE (t2));
647 /* Save space: see if the result is identical to one of the args. */
648 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1))
649 return build_type_attribute_variant (t1, attributes);
650 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2))
651 return build_type_attribute_variant (t2, attributes);
652 /* Merge the element types, and have a size if either arg has one. */
653 t1 = build_cplus_array_type
654 (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2));
659 /* Function types: prefer the one that specified arg types.
660 If both do, merge the arg types. Also merge the return types. */
662 tree valtype = merge_types (TREE_TYPE (t1), TREE_TYPE (t2));
663 tree p1 = TYPE_ARG_TYPES (t1);
664 tree p2 = TYPE_ARG_TYPES (t2);
667 /* Save space: see if the result is identical to one of the args. */
668 if (valtype == TREE_TYPE (t1) && ! p2)
669 return build_type_attribute_variant (t1, attributes);
670 if (valtype == TREE_TYPE (t2) && ! p1)
671 return build_type_attribute_variant (t2, attributes);
673 /* Simple way if one arg fails to specify argument types. */
674 if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node)
676 rval = build_function_type (valtype, p2);
677 if ((raises = TYPE_RAISES_EXCEPTIONS (t2)))
678 rval = build_exception_variant (rval, raises);
679 return build_type_attribute_variant (rval, attributes);
681 raises = TYPE_RAISES_EXCEPTIONS (t1);
682 if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node)
684 rval = build_function_type (valtype, p1);
686 rval = build_exception_variant (rval, raises);
687 return build_type_attribute_variant (rval, attributes);
690 rval = build_function_type (valtype, commonparms (p1, p2));
691 t1 = build_exception_variant (rval, raises);
697 /* Get this value the long way, since TYPE_METHOD_BASETYPE
698 is just the main variant of this. */
699 tree basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2)));
700 tree raises = TYPE_RAISES_EXCEPTIONS (t1);
703 /* If this was a member function type, get back to the
704 original type of type member function (i.e., without
705 the class instance variable up front. */
706 t1 = build_function_type (TREE_TYPE (t1),
707 TREE_CHAIN (TYPE_ARG_TYPES (t1)));
708 t2 = build_function_type (TREE_TYPE (t2),
709 TREE_CHAIN (TYPE_ARG_TYPES (t2)));
710 t3 = merge_types (t1, t2);
711 t3 = build_method_type_directly (basetype, TREE_TYPE (t3),
712 TYPE_ARG_TYPES (t3));
713 t1 = build_exception_variant (t3, raises);
719 return build_type_attribute_variant (t1, attributes);
722 /* Return the common type of two types.
723 We assume that comptypes has already been done and returned 1;
724 if that isn't so, this may crash.
726 This is the type for the result of most arithmetic operations
727 if the operands have the given two types. */
730 common_type (tree t1, tree t2)
732 enum tree_code code1;
733 enum tree_code code2;
735 /* If one type is nonsense, bail. */
736 if (t1 == error_mark_node || t2 == error_mark_node)
737 return error_mark_node;
739 code1 = TREE_CODE (t1);
740 code2 = TREE_CODE (t2);
742 if ((ARITHMETIC_TYPE_P (t1) || code1 == ENUMERAL_TYPE
743 || code1 == COMPLEX_TYPE)
744 && (ARITHMETIC_TYPE_P (t2) || code2 == ENUMERAL_TYPE
745 || code2 == COMPLEX_TYPE))
746 return type_after_usual_arithmetic_conversions (t1, t2);
748 else if ((TYPE_PTR_P (t1) && TYPE_PTR_P (t2))
749 || (TYPE_PTRMEM_P (t1) && TYPE_PTRMEM_P (t2))
750 || (TYPE_PTRMEMFUNC_P (t1) && TYPE_PTRMEMFUNC_P (t2)))
751 return composite_pointer_type (t1, t2, error_mark_node, error_mark_node,
757 /* Compare two exception specifier types for exactness or subsetness, if
758 allowed. Returns false for mismatch, true for match (same, or
761 [except.spec] "If a class X ... objects of class X or any class publicly
762 and unambiguously derived from X. Similarly, if a pointer type Y * ...
763 exceptions of type Y * or that are pointers to any type publicly and
764 unambiguously derived from Y. Otherwise a function only allows exceptions
765 that have the same type ..."
766 This does not mention cv qualifiers and is different to what throw
767 [except.throw] and catch [except.catch] will do. They will ignore the
768 top level cv qualifiers, and allow qualifiers in the pointer to class
771 We implement the letter of the standard. */
774 comp_except_types (tree a, tree b, bool exact)
776 if (same_type_p (a, b))
780 if (cp_type_quals (a) || cp_type_quals (b))
783 if (TREE_CODE (a) == POINTER_TYPE
784 && TREE_CODE (b) == POINTER_TYPE)
788 if (cp_type_quals (a) || cp_type_quals (b))
792 if (TREE_CODE (a) != RECORD_TYPE
793 || TREE_CODE (b) != RECORD_TYPE)
796 if (ACCESSIBLY_UNIQUELY_DERIVED_P (a, b))
802 /* Return true if TYPE1 and TYPE2 are equivalent exception specifiers.
803 If EXACT is false, T2 can be stricter than T1 (according to 15.4/7),
804 otherwise it must be exact. Exception lists are unordered, but
805 we've already filtered out duplicates. Most lists will be in order,
806 we should try to make use of that. */
809 comp_except_specs (tree t1, tree t2, bool exact)
818 if (t1 == NULL_TREE) /* T1 is ... */
819 return t2 == NULL_TREE || !exact;
820 if (!TREE_VALUE (t1)) /* t1 is EMPTY */
821 return t2 != NULL_TREE && !TREE_VALUE (t2);
822 if (t2 == NULL_TREE) /* T2 is ... */
824 if (TREE_VALUE (t1) && !TREE_VALUE (t2)) /* T2 is EMPTY, T1 is not */
827 /* Neither set is ... or EMPTY, make sure each part of T2 is in T1.
828 Count how many we find, to determine exactness. For exact matching and
829 ordered T1, T2, this is an O(n) operation, otherwise its worst case is
831 for (base = t1; t2 != NULL_TREE; t2 = TREE_CHAIN (t2))
833 for (probe = base; probe != NULL_TREE; probe = TREE_CHAIN (probe))
835 tree a = TREE_VALUE (probe);
836 tree b = TREE_VALUE (t2);
838 if (comp_except_types (a, b, exact))
840 if (probe == base && exact)
841 base = TREE_CHAIN (probe);
846 if (probe == NULL_TREE)
849 return !exact || base == NULL_TREE || length == list_length (t1);
852 /* Compare the array types T1 and T2. ALLOW_REDECLARATION is true if
853 [] can match [size]. */
856 comp_array_types (tree t1, tree t2, bool allow_redeclaration)
864 /* The type of the array elements must be the same. */
865 if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2)))
868 d1 = TYPE_DOMAIN (t1);
869 d2 = TYPE_DOMAIN (t2);
874 /* If one of the arrays is dimensionless, and the other has a
875 dimension, they are of different types. However, it is valid to
883 declarations for an array object can specify
884 array types that differ by the presence or absence of a major
885 array bound (_dcl.array_). */
887 return allow_redeclaration;
889 /* Check that the dimensions are the same. */
890 return (cp_tree_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2))
891 && cp_tree_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2)));
894 /* Return true if T1 and T2 are related as allowed by STRICT. STRICT
895 is a bitwise-or of the COMPARE_* flags. */
898 comptypes (tree t1, tree t2, int strict)
903 /* Suppress errors caused by previously reported errors */
904 if (t1 == error_mark_node || t2 == error_mark_node)
907 my_friendly_assert (TYPE_P (t1) && TYPE_P (t2), 20030623);
909 /* TYPENAME_TYPEs should be resolved if the qualifying scope is the
910 current instantiation. */
911 if (TREE_CODE (t1) == TYPENAME_TYPE)
913 tree resolved = resolve_typename_type (t1, /*only_current_p=*/true);
915 if (resolved != error_mark_node)
919 if (TREE_CODE (t2) == TYPENAME_TYPE)
921 tree resolved = resolve_typename_type (t2, /*only_current_p=*/true);
923 if (resolved != error_mark_node)
927 /* If either type is the internal version of sizetype, use the
929 if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1)
931 t1 = TYPE_DOMAIN (t1);
933 if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2)
935 t2 = TYPE_DOMAIN (t2);
937 if (TYPE_PTRMEMFUNC_P (t1))
938 t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1);
939 if (TYPE_PTRMEMFUNC_P (t2))
940 t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2);
942 /* Different classes of types can't be compatible. */
943 if (TREE_CODE (t1) != TREE_CODE (t2))
946 /* Qualifiers must match. */
947 if (cp_type_quals (t1) != cp_type_quals (t2))
949 if (TYPE_FOR_JAVA (t1) != TYPE_FOR_JAVA (t2))
952 /* Allow for two different type nodes which have essentially the same
953 definition. Note that we already checked for equality of the type
954 qualifiers (just above). */
956 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
959 if (!(*targetm.comp_type_attributes) (t1, t2))
962 switch (TREE_CODE (t1))
964 case TEMPLATE_TEMPLATE_PARM:
965 case BOUND_TEMPLATE_TEMPLATE_PARM:
966 if (TEMPLATE_TYPE_IDX (t1) != TEMPLATE_TYPE_IDX (t2)
967 || TEMPLATE_TYPE_LEVEL (t1) != TEMPLATE_TYPE_LEVEL (t2))
969 if (!comp_template_parms
970 (DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t1)),
971 DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t2))))
973 if (TREE_CODE (t1) == TEMPLATE_TEMPLATE_PARM)
975 /* Don't check inheritance. */
976 strict = COMPARE_STRICT;
981 if (TYPE_TEMPLATE_INFO (t1) && TYPE_TEMPLATE_INFO (t2)
982 && (TYPE_TI_TEMPLATE (t1) == TYPE_TI_TEMPLATE (t2)
983 || TREE_CODE (t1) == BOUND_TEMPLATE_TEMPLATE_PARM)
984 && comp_template_args (TYPE_TI_ARGS (t1), TYPE_TI_ARGS (t2)))
987 if ((strict & COMPARE_BASE) && DERIVED_FROM_P (t1, t2))
989 else if ((strict & COMPARE_DERIVED) && DERIVED_FROM_P (t2, t1))
995 if (!comptypes (TYPE_OFFSET_BASETYPE (t1), TYPE_OFFSET_BASETYPE (t2),
996 strict & ~COMPARE_REDECLARATION))
1001 case REFERENCE_TYPE:
1002 return same_type_p (TREE_TYPE (t1), TREE_TYPE (t2));
1006 if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2)))
1008 return compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2));
1011 /* Target types must match incl. qualifiers. */
1012 return comp_array_types (t1, t2, !!(strict & COMPARE_REDECLARATION));
1014 case TEMPLATE_TYPE_PARM:
1015 return (TEMPLATE_TYPE_IDX (t1) == TEMPLATE_TYPE_IDX (t2)
1016 && TEMPLATE_TYPE_LEVEL (t1) == TEMPLATE_TYPE_LEVEL (t2));
1019 if (!cp_tree_equal (TYPENAME_TYPE_FULLNAME (t1),
1020 TYPENAME_TYPE_FULLNAME (t2)))
1022 return same_type_p (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2));
1024 case UNBOUND_CLASS_TEMPLATE:
1025 if (!cp_tree_equal (TYPE_IDENTIFIER (t1), TYPE_IDENTIFIER (t2)))
1027 return same_type_p (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2));
1030 return same_type_p (TREE_TYPE (t1), TREE_TYPE (t2));
1038 /* Returns 1 if TYPE1 is at least as qualified as TYPE2. */
1041 at_least_as_qualified_p (tree type1, tree type2)
1043 int q1 = cp_type_quals (type1);
1044 int q2 = cp_type_quals (type2);
1046 /* All qualifiers for TYPE2 must also appear in TYPE1. */
1047 return (q1 & q2) == q2;
1050 /* Returns 1 if TYPE1 is more qualified than TYPE2. */
1053 more_qualified_p (tree type1, tree type2)
1055 int q1 = cp_type_quals (type1);
1056 int q2 = cp_type_quals (type2);
1058 return q1 != q2 && (q1 & q2) == q2;
1061 /* Returns 1 if TYPE1 is more cv-qualified than TYPE2, -1 if TYPE2 is
1062 more cv-qualified that TYPE1, and 0 otherwise. */
1065 comp_cv_qualification (tree type1, tree type2)
1067 int q1 = cp_type_quals (type1);
1068 int q2 = cp_type_quals (type2);
1073 if ((q1 & q2) == q2)
1075 else if ((q1 & q2) == q1)
1081 /* Returns 1 if the cv-qualification signature of TYPE1 is a proper
1082 subset of the cv-qualification signature of TYPE2, and the types
1083 are similar. Returns -1 if the other way 'round, and 0 otherwise. */
1086 comp_cv_qual_signature (tree type1, tree type2)
1088 if (comp_ptr_ttypes_real (type2, type1, -1))
1090 else if (comp_ptr_ttypes_real (type1, type2, -1))
1096 /* If two types share a common base type, return that basetype.
1097 If there is not a unique most-derived base type, this function
1098 returns ERROR_MARK_NODE. */
1101 common_base_type (tree tt1, tree tt2)
1103 tree best = NULL_TREE;
1106 /* If one is a baseclass of another, that's good enough. */
1107 if (UNIQUELY_DERIVED_FROM_P (tt1, tt2))
1109 if (UNIQUELY_DERIVED_FROM_P (tt2, tt1))
1112 /* Otherwise, try to find a unique baseclass of TT1
1113 that is shared by TT2, and follow that down. */
1114 for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--)
1116 tree basetype = TYPE_BINFO_BASETYPE (tt1, i);
1117 tree trial = common_base_type (basetype, tt2);
1120 if (trial == error_mark_node)
1122 if (best == NULL_TREE)
1124 else if (best != trial)
1125 return error_mark_node;
1130 for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--)
1132 tree basetype = TYPE_BINFO_BASETYPE (tt2, i);
1133 tree trial = common_base_type (tt1, basetype);
1136 if (trial == error_mark_node)
1138 if (best == NULL_TREE)
1140 else if (best != trial)
1141 return error_mark_node;
1147 /* Subroutines of `comptypes'. */
1149 /* Return true if two parameter type lists PARMS1 and PARMS2 are
1150 equivalent in the sense that functions with those parameter types
1151 can have equivalent types. The two lists must be equivalent,
1152 element by element. */
1155 compparms (tree parms1, tree parms2)
1159 /* An unspecified parmlist matches any specified parmlist
1160 whose argument types don't need default promotions. */
1162 for (t1 = parms1, t2 = parms2;
1164 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1166 /* If one parmlist is shorter than the other,
1167 they fail to match. */
1170 if (!same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1177 /* Process a sizeof or alignof expression where the operand is a
1181 cxx_sizeof_or_alignof_type (tree type, enum tree_code op, bool complain)
1183 enum tree_code type_code;
1185 const char *op_name;
1187 my_friendly_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR, 20020720);
1188 if (type == error_mark_node)
1189 return error_mark_node;
1191 if (processing_template_decl)
1193 value = build_min (op, size_type_node, type);
1194 TREE_READONLY (value) = 1;
1198 op_name = operator_name_info[(int) op].name;
1200 type = non_reference (type);
1201 type_code = TREE_CODE (type);
1203 if (type_code == METHOD_TYPE)
1205 if (complain && (pedantic || warn_pointer_arith))
1206 pedwarn ("invalid application of `%s' to a member function", op_name);
1207 value = size_one_node;
1210 value = c_sizeof_or_alignof_type (complete_type (type), op, complain);
1215 /* Process a sizeof or alignof expression where the operand is an
1219 cxx_sizeof_or_alignof_expr (tree e, enum tree_code op)
1221 const char *op_name = operator_name_info[(int) op].name;
1223 if (e == error_mark_node)
1224 return error_mark_node;
1226 if (processing_template_decl)
1228 e = build_min (op, size_type_node, e);
1229 TREE_SIDE_EFFECTS (e) = 0;
1230 TREE_READONLY (e) = 1;
1235 if (TREE_CODE (e) == COMPONENT_REF
1236 && TREE_CODE (TREE_OPERAND (e, 1)) == FIELD_DECL
1237 && DECL_C_BIT_FIELD (TREE_OPERAND (e, 1)))
1239 error ("invalid application of `%s' to a bit-field", op_name);
1242 else if (is_overloaded_fn (e))
1244 pedwarn ("ISO C++ forbids applying `%s' to an expression of function type", op_name);
1247 else if (type_unknown_p (e))
1249 cxx_incomplete_type_error (e, TREE_TYPE (e));
1255 return cxx_sizeof_or_alignof_type (e, op, true);
1259 /* Perform the conversions in [expr] that apply when an lvalue appears
1260 in an rvalue context: the lvalue-to-rvalue, array-to-pointer, and
1261 function-to-pointer conversions.
1263 In addition manifest constants are replaced by their values. */
1266 decay_conversion (tree exp)
1269 register enum tree_code code;
1271 type = TREE_TYPE (exp);
1272 code = TREE_CODE (type);
1274 if (code == REFERENCE_TYPE)
1276 exp = convert_from_reference (exp);
1277 type = TREE_TYPE (exp);
1278 code = TREE_CODE (type);
1281 if (type == error_mark_node)
1282 return error_mark_node;
1284 if (type_unknown_p (exp))
1286 cxx_incomplete_type_error (exp, TREE_TYPE (exp));
1287 return error_mark_node;
1290 /* Constants can be used directly unless they're not loadable. */
1291 if (TREE_CODE (exp) == CONST_DECL)
1292 exp = DECL_INITIAL (exp);
1293 /* Replace a nonvolatile const static variable with its value. We
1294 don't do this for arrays, though; we want the address of the
1295 first element of the array, not the address of the first element
1296 of its initializing constant. */
1297 else if (code != ARRAY_TYPE)
1299 exp = decl_constant_value (exp);
1300 type = TREE_TYPE (exp);
1303 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
1304 Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */
1306 if (code == VOID_TYPE)
1308 error ("void value not ignored as it ought to be");
1309 return error_mark_node;
1311 if (code == METHOD_TYPE)
1313 error ("invalid use of non-static member function");
1314 return error_mark_node;
1316 if (code == FUNCTION_TYPE || is_overloaded_fn (exp))
1317 return build_unary_op (ADDR_EXPR, exp, 0);
1318 if (code == ARRAY_TYPE)
1323 if (TREE_CODE (exp) == INDIRECT_REF)
1324 return build_nop (build_pointer_type (TREE_TYPE (type)),
1325 TREE_OPERAND (exp, 0));
1327 if (TREE_CODE (exp) == COMPOUND_EXPR)
1329 tree op1 = decay_conversion (TREE_OPERAND (exp, 1));
1330 return build (COMPOUND_EXPR, TREE_TYPE (op1),
1331 TREE_OPERAND (exp, 0), op1);
1335 && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp)))
1337 error ("invalid use of non-lvalue array");
1338 return error_mark_node;
1341 ptrtype = build_pointer_type (TREE_TYPE (type));
1343 if (TREE_CODE (exp) == VAR_DECL)
1345 /* ??? This is not really quite correct
1346 in that the type of the operand of ADDR_EXPR
1347 is not the target type of the type of the ADDR_EXPR itself.
1348 Question is, can this lossage be avoided? */
1349 adr = build1 (ADDR_EXPR, ptrtype, exp);
1350 if (!cxx_mark_addressable (exp))
1351 return error_mark_node;
1352 TREE_CONSTANT (adr) = staticp (exp);
1353 TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
1356 /* This way is better for a COMPONENT_REF since it can
1357 simplify the offset for a component. */
1358 adr = build_unary_op (ADDR_EXPR, exp, 1);
1359 return cp_convert (ptrtype, adr);
1362 /* [basic.lval]: Class rvalues can have cv-qualified types; non-class
1363 rvalues always have cv-unqualified types. */
1364 if (! CLASS_TYPE_P (type))
1365 exp = cp_convert (TYPE_MAIN_VARIANT (type), exp);
1371 default_conversion (tree exp)
1373 exp = decay_conversion (exp);
1375 if (INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (exp)))
1376 exp = perform_integral_promotions (exp);
1381 /* EXPR is an expression with an integral or enumeration type.
1382 Perform the integral promotions in [conv.prom], and return the
1386 perform_integral_promotions (tree expr)
1391 type = TREE_TYPE (expr);
1392 my_friendly_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type), 20030703);
1393 promoted_type = type_promotes_to (type);
1394 if (type != promoted_type)
1395 expr = cp_convert (promoted_type, expr);
1399 /* Take the address of an inline function without setting TREE_ADDRESSABLE
1403 inline_conversion (tree exp)
1405 if (TREE_CODE (exp) == FUNCTION_DECL)
1406 exp = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (exp)), exp);
1411 /* Returns nonzero iff exp is a STRING_CST or the result of applying
1412 decay_conversion to one. */
1415 string_conv_p (tree totype, tree exp, int warn)
1419 if (! flag_const_strings || TREE_CODE (totype) != POINTER_TYPE)
1422 t = TREE_TYPE (totype);
1423 if (!same_type_p (t, char_type_node)
1424 && !same_type_p (t, wchar_type_node))
1427 if (TREE_CODE (exp) == STRING_CST)
1429 /* Make sure that we don't try to convert between char and wchar_t. */
1430 if (!same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (exp))), t))
1435 /* Is this a string constant which has decayed to 'const char *'? */
1436 t = build_pointer_type (build_qualified_type (t, TYPE_QUAL_CONST));
1437 if (!same_type_p (TREE_TYPE (exp), t))
1440 if (TREE_CODE (exp) != ADDR_EXPR
1441 || TREE_CODE (TREE_OPERAND (exp, 0)) != STRING_CST)
1445 /* This warning is not very useful, as it complains about printf. */
1446 if (warn && warn_write_strings)
1447 warning ("deprecated conversion from string constant to `%T'", totype);
1452 /* Given a COND_EXPR, MIN_EXPR, or MAX_EXPR in T, return it in a form that we
1453 can, for example, use as an lvalue. This code used to be in
1454 unary_complex_lvalue, but we needed it to deal with `a = (d == c) ? b : c'
1455 expressions, where we're dealing with aggregates. But now it's again only
1456 called from unary_complex_lvalue. The case (in particular) that led to
1457 this was with CODE == ADDR_EXPR, since it's not an lvalue when we'd
1461 rationalize_conditional_expr (enum tree_code code, tree t)
1463 /* For MIN_EXPR or MAX_EXPR, fold-const.c has arranged things so that
1464 the first operand is always the one to be used if both operands
1465 are equal, so we know what conditional expression this used to be. */
1466 if (TREE_CODE (t) == MIN_EXPR || TREE_CODE (t) == MAX_EXPR)
1469 build_conditional_expr (build_x_binary_op ((TREE_CODE (t) == MIN_EXPR
1470 ? LE_EXPR : GE_EXPR),
1471 TREE_OPERAND (t, 0),
1472 TREE_OPERAND (t, 1)),
1473 build_unary_op (code, TREE_OPERAND (t, 0), 0),
1474 build_unary_op (code, TREE_OPERAND (t, 1), 0));
1478 build_conditional_expr (TREE_OPERAND (t, 0),
1479 build_unary_op (code, TREE_OPERAND (t, 1), 0),
1480 build_unary_op (code, TREE_OPERAND (t, 2), 0));
1483 /* Given the TYPE of an anonymous union field inside T, return the
1484 FIELD_DECL for the field. If not found return NULL_TREE. Because
1485 anonymous unions can nest, we must also search all anonymous unions
1486 that are directly reachable. */
1489 lookup_anon_field (tree t, tree type)
1493 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
1495 if (TREE_STATIC (field))
1497 if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))
1500 /* If we find it directly, return the field. */
1501 if (DECL_NAME (field) == NULL_TREE
1502 && type == TYPE_MAIN_VARIANT (TREE_TYPE (field)))
1507 /* Otherwise, it could be nested, search harder. */
1508 if (DECL_NAME (field) == NULL_TREE
1509 && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1511 tree subfield = lookup_anon_field (TREE_TYPE (field), type);
1519 /* Build an expression representing OBJECT.MEMBER. OBJECT is an
1520 expression; MEMBER is a DECL or baselink. If ACCESS_PATH is
1521 non-NULL, it indicates the path to the base used to name MEMBER.
1522 If PRESERVE_REFERENCE is true, the expression returned will have
1523 REFERENCE_TYPE if the MEMBER does. Otherwise, the expression
1524 returned will have the type referred to by the reference.
1526 This function does not perform access control; that is either done
1527 earlier by the parser when the name of MEMBER is resolved to MEMBER
1528 itself, or later when overload resolution selects one of the
1529 functions indicated by MEMBER. */
1532 build_class_member_access_expr (tree object, tree member,
1533 tree access_path, bool preserve_reference)
1537 tree result = NULL_TREE;
1539 if (object == error_mark_node || member == error_mark_node)
1540 return error_mark_node;
1542 if (TREE_CODE (member) == PSEUDO_DTOR_EXPR)
1545 my_friendly_assert (DECL_P (member) || BASELINK_P (member),
1550 The type of the first expression shall be "class object" (of a
1552 object_type = TREE_TYPE (object);
1553 if (!complete_type_or_else (object_type, object))
1554 return error_mark_node;
1555 if (!CLASS_TYPE_P (object_type))
1557 error ("request for member `%D' in `%E', which is of non-class type `%T'",
1558 member, object, object_type);
1559 return error_mark_node;
1562 /* The standard does not seem to actually say that MEMBER must be a
1563 member of OBJECT_TYPE. However, that is clearly what is
1565 if (DECL_P (member))
1567 member_scope = DECL_CLASS_CONTEXT (member);
1569 if (TREE_DEPRECATED (member))
1570 warn_deprecated_use (member);
1573 member_scope = BINFO_TYPE (BASELINK_BINFO (member));
1574 /* If MEMBER is from an anonymous aggregate, MEMBER_SCOPE will
1575 presently be the anonymous union. Go outwards until we find a
1576 type related to OBJECT_TYPE. */
1577 while (ANON_AGGR_TYPE_P (member_scope)
1578 && !same_type_ignoring_top_level_qualifiers_p (member_scope,
1580 member_scope = TYPE_CONTEXT (member_scope);
1581 if (!member_scope || !DERIVED_FROM_P (member_scope, object_type))
1583 if (TREE_CODE (member) == FIELD_DECL)
1584 error ("invalid use of nonstatic data member '%E'", member);
1586 error ("`%D' is not a member of `%T'", member, object_type);
1587 return error_mark_node;
1590 /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x' into
1591 `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only an lvalue
1592 in the frontend; only _DECLs and _REFs are lvalues in the backend. */
1594 tree temp = unary_complex_lvalue (ADDR_EXPR, object);
1596 object = build_indirect_ref (temp, NULL);
1599 /* In [expr.ref], there is an explicit list of the valid choices for
1600 MEMBER. We check for each of those cases here. */
1601 if (TREE_CODE (member) == VAR_DECL)
1603 /* A static data member. */
1605 /* If OBJECT has side-effects, they are supposed to occur. */
1606 if (TREE_SIDE_EFFECTS (object))
1607 result = build (COMPOUND_EXPR, TREE_TYPE (result), object, result);
1609 else if (TREE_CODE (member) == FIELD_DECL)
1611 /* A non-static data member. */
1616 null_object_p = (TREE_CODE (object) == INDIRECT_REF
1617 && integer_zerop (TREE_OPERAND (object, 0)));
1619 /* Convert OBJECT to the type of MEMBER. */
1620 if (!same_type_p (TYPE_MAIN_VARIANT (object_type),
1621 TYPE_MAIN_VARIANT (member_scope)))
1626 binfo = lookup_base (access_path ? access_path : object_type,
1627 member_scope, ba_ignore, &kind);
1628 if (binfo == error_mark_node)
1629 return error_mark_node;
1631 /* It is invalid to try to get to a virtual base of a
1632 NULL object. The most common cause is invalid use of
1634 if (null_object_p && kind == bk_via_virtual)
1636 error ("invalid access to non-static data member `%D' of NULL object",
1638 error ("(perhaps the `offsetof' macro was used incorrectly)");
1639 return error_mark_node;
1642 /* Convert to the base. */
1643 object = build_base_path (PLUS_EXPR, object, binfo,
1645 /* If we found the base successfully then we should be able
1646 to convert to it successfully. */
1647 my_friendly_assert (object != error_mark_node,
1651 /* Complain about other invalid uses of offsetof, even though they will
1652 give the right answer. Note that we complain whether or not they
1653 actually used the offsetof macro, since there's no way to know at this
1654 point. So we just give a warning, instead of a pedwarn. */
1655 if (null_object_p && warn_invalid_offsetof
1656 && CLASSTYPE_NON_POD_P (object_type))
1658 warning ("invalid access to non-static data member `%D' of NULL object",
1660 warning ("(perhaps the `offsetof' macro was used incorrectly)");
1663 /* If MEMBER is from an anonymous aggregate, we have converted
1664 OBJECT so that it refers to the class containing the
1665 anonymous union. Generate a reference to the anonymous union
1666 itself, and recur to find MEMBER. */
1667 if (ANON_AGGR_TYPE_P (DECL_CONTEXT (member))
1668 /* When this code is called from build_field_call, the
1669 object already has the type of the anonymous union.
1670 That is because the COMPONENT_REF was already
1671 constructed, and was then disassembled before calling
1672 build_field_call. After the function-call code is
1673 cleaned up, this waste can be eliminated. */
1674 && (!same_type_ignoring_top_level_qualifiers_p
1675 (TREE_TYPE (object), DECL_CONTEXT (member))))
1677 tree anonymous_union;
1679 anonymous_union = lookup_anon_field (TREE_TYPE (object),
1680 DECL_CONTEXT (member));
1681 object = build_class_member_access_expr (object,
1683 /*access_path=*/NULL_TREE,
1684 preserve_reference);
1687 /* Compute the type of the field, as described in [expr.ref]. */
1688 type_quals = TYPE_UNQUALIFIED;
1689 member_type = TREE_TYPE (member);
1690 if (TREE_CODE (member_type) != REFERENCE_TYPE)
1692 type_quals = (cp_type_quals (member_type)
1693 | cp_type_quals (object_type));
1695 /* A field is const (volatile) if the enclosing object, or the
1696 field itself, is const (volatile). But, a mutable field is
1697 not const, even within a const object. */
1698 if (DECL_MUTABLE_P (member))
1699 type_quals &= ~TYPE_QUAL_CONST;
1700 member_type = cp_build_qualified_type (member_type, type_quals);
1703 result = fold (build (COMPONENT_REF, member_type, object, member));
1705 /* Mark the expression const or volatile, as appropriate. Even
1706 though we've dealt with the type above, we still have to mark the
1707 expression itself. */
1708 if (type_quals & TYPE_QUAL_CONST)
1709 TREE_READONLY (result) = 1;
1710 else if (type_quals & TYPE_QUAL_VOLATILE)
1711 TREE_THIS_VOLATILE (result) = 1;
1713 else if (BASELINK_P (member))
1715 /* The member is a (possibly overloaded) member function. */
1719 /* If the MEMBER is exactly one static member function, then we
1720 know the type of the expression. Otherwise, we must wait
1721 until overload resolution has been performed. */
1722 functions = BASELINK_FUNCTIONS (member);
1723 if (TREE_CODE (functions) == FUNCTION_DECL
1724 && DECL_STATIC_FUNCTION_P (functions))
1725 type = TREE_TYPE (functions);
1727 type = unknown_type_node;
1728 /* Note that we do not convert OBJECT to the BASELINK_BINFO
1729 base. That will happen when the function is called. */
1730 result = build (COMPONENT_REF, type, object, member);
1732 else if (TREE_CODE (member) == CONST_DECL)
1734 /* The member is an enumerator. */
1736 /* If OBJECT has side-effects, they are supposed to occur. */
1737 if (TREE_SIDE_EFFECTS (object))
1738 result = build (COMPOUND_EXPR, TREE_TYPE (result),
1743 error ("invalid use of `%D'", member);
1744 return error_mark_node;
1747 if (!preserve_reference)
1750 If E2 is declared to have type "reference to T", then ... the
1751 type of E1.E2 is T. */
1752 result = convert_from_reference (result);
1757 /* Return the destructor denoted by OBJECT.SCOPE::~DTOR_NAME, or, if
1758 SCOPE is NULL, by OBJECT.~DTOR_NAME. */
1761 lookup_destructor (tree object, tree scope, tree dtor_name)
1763 tree object_type = TREE_TYPE (object);
1764 tree dtor_type = TREE_OPERAND (dtor_name, 0);
1766 if (scope && !check_dtor_name (scope, dtor_name))
1768 error ("qualified type `%T' does not match destructor name `~%T'",
1770 return error_mark_node;
1772 if (!same_type_p (dtor_type, TYPE_MAIN_VARIANT (object_type)))
1774 error ("destructor name `%T' does not match type `%T' of expression",
1775 dtor_type, object_type);
1776 return error_mark_node;
1778 if (!TYPE_HAS_DESTRUCTOR (object_type))
1779 return build (PSEUDO_DTOR_EXPR, void_type_node, object, scope,
1781 return lookup_member (object_type, complete_dtor_identifier,
1782 /*protect=*/1, /*want_type=*/false);
1785 /* This function is called by the parser to process a class member
1786 access expression of the form OBJECT.NAME. NAME is a node used by
1787 the parser to represent a name; it is not yet a DECL. It may,
1788 however, be a BASELINK where the BASELINK_FUNCTIONS is a
1789 TEMPLATE_ID_EXPR. Templates must be looked up by the parser, and
1790 there is no reason to do the lookup twice, so the parser keeps the
1794 finish_class_member_access_expr (tree object, tree name)
1799 tree access_path = NULL_TREE;
1800 tree orig_object = object;
1801 tree orig_name = name;
1803 if (object == error_mark_node || name == error_mark_node)
1804 return error_mark_node;
1806 object_type = TREE_TYPE (object);
1808 if (processing_template_decl)
1810 if (/* If OBJECT_TYPE is dependent, so is OBJECT.NAME. */
1811 dependent_type_p (object_type)
1812 /* If NAME is "f<args>", where either 'f' or 'args' is
1813 dependent, then the expression is dependent. */
1814 || (TREE_CODE (name) == TEMPLATE_ID_EXPR
1815 && dependent_template_id_p (TREE_OPERAND (name, 0),
1816 TREE_OPERAND (name, 1)))
1817 /* If NAME is "T::X" where "T" is dependent, then the
1818 expression is dependent. */
1819 || (TREE_CODE (name) == SCOPE_REF
1820 && TYPE_P (TREE_OPERAND (name, 0))
1821 && dependent_type_p (TREE_OPERAND (name, 0))))
1822 return build_min_nt (COMPONENT_REF, object, name);
1823 object = build_non_dependent_expr (object);
1826 if (TREE_CODE (object_type) == REFERENCE_TYPE)
1828 object = convert_from_reference (object);
1829 object_type = TREE_TYPE (object);
1834 The type of the first expression shall be "class object" (of a
1836 if (!complete_type_or_else (object_type, object))
1837 return error_mark_node;
1838 if (!CLASS_TYPE_P (object_type))
1840 error ("request for member `%D' in `%E', which is of non-class type `%T'",
1841 name, object, object_type);
1842 return error_mark_node;
1845 if (BASELINK_P (name))
1847 /* A member function that has already been looked up. */
1848 my_friendly_assert ((TREE_CODE (BASELINK_FUNCTIONS (name))
1849 == TEMPLATE_ID_EXPR),
1855 bool is_template_id = false;
1856 tree template_args = NULL_TREE;
1859 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
1861 is_template_id = true;
1862 template_args = TREE_OPERAND (name, 1);
1863 name = TREE_OPERAND (name, 0);
1865 if (TREE_CODE (name) == OVERLOAD)
1866 name = DECL_NAME (get_first_fn (name));
1867 else if (DECL_P (name))
1868 name = DECL_NAME (name);
1871 if (TREE_CODE (name) == SCOPE_REF)
1873 /* A qualified name. The qualifying class or namespace `S' has
1874 already been looked up; it is either a TYPE or a
1875 NAMESPACE_DECL. The member name is either an IDENTIFIER_NODE
1876 or a BIT_NOT_EXPR. */
1877 scope = TREE_OPERAND (name, 0);
1878 name = TREE_OPERAND (name, 1);
1879 my_friendly_assert ((CLASS_TYPE_P (scope)
1880 || TREE_CODE (scope) == NAMESPACE_DECL),
1882 my_friendly_assert ((TREE_CODE (name) == IDENTIFIER_NODE
1883 || TREE_CODE (name) == BIT_NOT_EXPR),
1886 /* If SCOPE is a namespace, then the qualified name does not
1887 name a member of OBJECT_TYPE. */
1888 if (TREE_CODE (scope) == NAMESPACE_DECL)
1890 error ("`%D::%D' is not a member of `%T'",
1891 scope, name, object_type);
1892 return error_mark_node;
1895 /* Find the base of OBJECT_TYPE corresponding to SCOPE. */
1896 access_path = lookup_base (object_type, scope, ba_check, NULL);
1897 if (access_path == error_mark_node)
1898 return error_mark_node;
1901 error ("`%T' is not a base of `%T'", scope, object_type);
1902 return error_mark_node;
1908 access_path = object_type;
1911 if (TREE_CODE (name) == BIT_NOT_EXPR)
1912 member = lookup_destructor (object, scope, name);
1915 /* Look up the member. */
1916 member = lookup_member (access_path, name, /*protect=*/1,
1917 /*want_type=*/false);
1918 if (member == NULL_TREE)
1920 error ("'%D' has no member named '%E'", object_type, name);
1921 return error_mark_node;
1923 if (member == error_mark_node)
1924 return error_mark_node;
1929 tree template = member;
1931 if (BASELINK_P (template))
1932 template = lookup_template_function (template, template_args);
1935 error ("`%D' is not a member template function", name);
1936 return error_mark_node;
1941 if (TREE_DEPRECATED (member))
1942 warn_deprecated_use (member);
1944 expr = build_class_member_access_expr (object, member, access_path,
1945 /*preserve_reference=*/false);
1946 if (processing_template_decl && expr != error_mark_node)
1947 return build_min_non_dep (COMPONENT_REF, expr,
1948 orig_object, orig_name);
1952 /* Return an expression for the MEMBER_NAME field in the internal
1953 representation of PTRMEM, a pointer-to-member function. (Each
1954 pointer-to-member function type gets its own RECORD_TYPE so it is
1955 more convenient to access the fields by name than by FIELD_DECL.)
1956 This routine converts the NAME to a FIELD_DECL and then creates the
1957 node for the complete expression. */
1960 build_ptrmemfunc_access_expr (tree ptrmem, tree member_name)
1966 /* This code is a stripped down version of
1967 build_class_member_access_expr. It does not work to use that
1968 routine directly because it expects the object to be of class
1970 ptrmem_type = TREE_TYPE (ptrmem);
1971 my_friendly_assert (TYPE_PTRMEMFUNC_P (ptrmem_type), 20020804);
1972 member = lookup_member (ptrmem_type, member_name, /*protect=*/0,
1973 /*want_type=*/false);
1974 member_type = cp_build_qualified_type (TREE_TYPE (member),
1975 cp_type_quals (ptrmem_type));
1976 return fold (build (COMPONENT_REF, member_type, ptrmem, member));
1979 /* Given an expression PTR for a pointer, return an expression
1980 for the value pointed to.
1981 ERRORSTRING is the name of the operator to appear in error messages.
1983 This function may need to overload OPERATOR_FNNAME.
1984 Must also handle REFERENCE_TYPEs for C++. */
1987 build_x_indirect_ref (tree expr, const char *errorstring)
1989 tree orig_expr = expr;
1992 if (processing_template_decl)
1994 if (type_dependent_expression_p (expr))
1995 return build_min_nt (INDIRECT_REF, expr);
1996 expr = build_non_dependent_expr (expr);
1999 rval = build_new_op (INDIRECT_REF, LOOKUP_NORMAL, expr, NULL_TREE,
2002 rval = build_indirect_ref (expr, errorstring);
2004 if (processing_template_decl && rval != error_mark_node)
2005 return build_min_non_dep (INDIRECT_REF, rval, orig_expr);
2011 build_indirect_ref (tree ptr, const char *errorstring)
2013 register tree pointer, type;
2015 if (ptr == error_mark_node)
2016 return error_mark_node;
2018 if (ptr == current_class_ptr)
2019 return current_class_ref;
2021 pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE
2022 ? ptr : decay_conversion (ptr));
2023 type = TREE_TYPE (pointer);
2025 if (TYPE_PTR_P (type) || TREE_CODE (type) == REFERENCE_TYPE)
2029 If the type of the expression is "pointer to T," the type
2030 of the result is "T."
2032 We must use the canonical variant because certain parts of
2033 the back end, like fold, do pointer comparisons between
2035 tree t = canonical_type_variant (TREE_TYPE (type));
2037 if (VOID_TYPE_P (t))
2039 /* A pointer to incomplete type (other than cv void) can be
2040 dereferenced [expr.unary.op]/1 */
2041 error ("`%T' is not a pointer-to-object type", type);
2042 return error_mark_node;
2044 else if (TREE_CODE (pointer) == ADDR_EXPR
2045 && same_type_p (t, TREE_TYPE (TREE_OPERAND (pointer, 0))))
2046 /* The POINTER was something like `&x'. We simplify `*&x' to
2048 return TREE_OPERAND (pointer, 0);
2051 tree ref = build1 (INDIRECT_REF, t, pointer);
2053 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
2054 so that we get the proper error message if the result is used
2055 to assign to. Also, &* is supposed to be a no-op. */
2056 TREE_READONLY (ref) = CP_TYPE_CONST_P (t);
2057 TREE_THIS_VOLATILE (ref) = CP_TYPE_VOLATILE_P (t);
2058 TREE_SIDE_EFFECTS (ref)
2059 = (TREE_THIS_VOLATILE (ref) || TREE_SIDE_EFFECTS (pointer));
2063 /* `pointer' won't be an error_mark_node if we were given a
2064 pointer to member, so it's cool to check for this here. */
2065 else if (TYPE_PTR_TO_MEMBER_P (type))
2066 error ("invalid use of `%s' on pointer to member", errorstring);
2067 else if (pointer != error_mark_node)
2070 error ("invalid type argument of `%s'", errorstring);
2072 error ("invalid type argument");
2074 return error_mark_node;
2077 /* This handles expressions of the form "a[i]", which denotes
2080 This is logically equivalent in C to *(a+i), but we may do it differently.
2081 If A is a variable or a member, we generate a primitive ARRAY_REF.
2082 This avoids forcing the array out of registers, and can work on
2083 arrays that are not lvalues (for example, members of structures returned
2086 If INDEX is of some user-defined type, it must be converted to
2087 integer type. Otherwise, to make a compatible PLUS_EXPR, it
2088 will inherit the type of the array, which will be some pointer type. */
2091 build_array_ref (tree array, tree idx)
2095 error ("subscript missing in array reference");
2096 return error_mark_node;
2099 if (TREE_TYPE (array) == error_mark_node
2100 || TREE_TYPE (idx) == error_mark_node)
2101 return error_mark_node;
2103 /* If ARRAY is a COMPOUND_EXPR or COND_EXPR, move our reference
2105 switch (TREE_CODE (array))
2109 tree value = build_array_ref (TREE_OPERAND (array, 1), idx);
2110 return build (COMPOUND_EXPR, TREE_TYPE (value),
2111 TREE_OPERAND (array, 0), value);
2115 return build_conditional_expr
2116 (TREE_OPERAND (array, 0),
2117 build_array_ref (TREE_OPERAND (array, 1), idx),
2118 build_array_ref (TREE_OPERAND (array, 2), idx));
2124 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE
2125 && TREE_CODE (array) != INDIRECT_REF)
2129 /* Subscripting with type char is likely to lose
2130 on a machine where chars are signed.
2131 So warn on any machine, but optionally.
2132 Don't warn for unsigned char since that type is safe.
2133 Don't warn for signed char because anyone who uses that
2134 must have done so deliberately. */
2135 if (warn_char_subscripts
2136 && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node)
2137 warning ("array subscript has type `char'");
2139 if (!INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (idx)))
2141 error ("array subscript is not an integer");
2142 return error_mark_node;
2145 /* Apply integral promotions *after* noticing character types.
2146 (It is unclear why we do these promotions -- the standard
2147 does not say that we should. In fact, the natual thing would
2148 seem to be to convert IDX to ptrdiff_t; we're performing
2149 pointer arithmetic.) */
2150 idx = perform_integral_promotions (idx);
2152 /* An array that is indexed by a non-constant
2153 cannot be stored in a register; we must be able to do
2154 address arithmetic on its address.
2155 Likewise an array of elements of variable size. */
2156 if (TREE_CODE (idx) != INTEGER_CST
2157 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array)))
2158 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))))
2161 if (!cxx_mark_addressable (array))
2162 return error_mark_node;
2165 /* An array that is indexed by a constant value which is not within
2166 the array bounds cannot be stored in a register either; because we
2167 would get a crash in store_bit_field/extract_bit_field when trying
2168 to access a non-existent part of the register. */
2169 if (TREE_CODE (idx) == INTEGER_CST
2170 && TYPE_VALUES (TREE_TYPE (array))
2171 && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array))))
2173 if (!cxx_mark_addressable (array))
2174 return error_mark_node;
2177 if (pedantic && !lvalue_p (array))
2178 pedwarn ("ISO C++ forbids subscripting non-lvalue array");
2180 /* Note in C++ it is valid to subscript a `register' array, since
2181 it is valid to take the address of something with that
2182 storage specification. */
2186 while (TREE_CODE (foo) == COMPONENT_REF)
2187 foo = TREE_OPERAND (foo, 0);
2188 if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo))
2189 warning ("subscripting array declared `register'");
2192 type = TREE_TYPE (TREE_TYPE (array));
2193 rval = build (ARRAY_REF, type, array, idx);
2194 /* Array ref is const/volatile if the array elements are
2195 or if the array is.. */
2196 TREE_READONLY (rval)
2197 |= (CP_TYPE_CONST_P (type) | TREE_READONLY (array));
2198 TREE_SIDE_EFFECTS (rval)
2199 |= (CP_TYPE_VOLATILE_P (type) | TREE_SIDE_EFFECTS (array));
2200 TREE_THIS_VOLATILE (rval)
2201 |= (CP_TYPE_VOLATILE_P (type) | TREE_THIS_VOLATILE (array));
2202 return require_complete_type (fold (rval));
2206 tree ar = default_conversion (array);
2207 tree ind = default_conversion (idx);
2209 /* Put the integer in IND to simplify error checking. */
2210 if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE)
2217 if (ar == error_mark_node)
2220 if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE)
2222 error ("subscripted value is neither array nor pointer");
2223 return error_mark_node;
2225 if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE)
2227 error ("array subscript is not an integer");
2228 return error_mark_node;
2231 return build_indirect_ref (cp_build_binary_op (PLUS_EXPR, ar, ind),
2236 /* Resolve a pointer to member function. INSTANCE is the object
2237 instance to use, if the member points to a virtual member.
2239 This used to avoid checking for virtual functions if basetype
2240 has no virtual functions, according to an earlier ANSI draft.
2241 With the final ISO C++ rules, such an optimization is
2242 incorrect: A pointer to a derived member can be static_cast
2243 to pointer-to-base-member, as long as the dynamic object
2244 later has the right member. */
2247 get_member_function_from_ptrfunc (tree *instance_ptrptr, tree function)
2249 if (TREE_CODE (function) == OFFSET_REF)
2250 function = TREE_OPERAND (function, 1);
2252 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function)))
2254 tree idx, delta, e1, e2, e3, vtbl, basetype;
2255 tree fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function));
2257 tree instance_ptr = *instance_ptrptr;
2258 tree instance_save_expr = 0;
2259 if (instance_ptr == error_mark_node)
2261 if (TREE_CODE (function) == PTRMEM_CST)
2263 /* Extracting the function address from a pmf is only
2264 allowed with -Wno-pmf-conversions. It only works for
2266 e1 = build_addr_func (PTRMEM_CST_MEMBER (function));
2267 e1 = convert (fntype, e1);
2272 error ("object missing in use of `%E'", function);
2273 return error_mark_node;
2277 if (TREE_SIDE_EFFECTS (instance_ptr))
2278 instance_ptr = instance_save_expr = save_expr (instance_ptr);
2280 if (TREE_SIDE_EFFECTS (function))
2281 function = save_expr (function);
2283 /* Start by extracting all the information from the PMF itself. */
2284 e3 = PFN_FROM_PTRMEMFUNC (function);
2285 delta = build_ptrmemfunc_access_expr (function, delta_identifier);
2286 idx = build1 (NOP_EXPR, vtable_index_type, e3);
2287 switch (TARGET_PTRMEMFUNC_VBIT_LOCATION)
2289 case ptrmemfunc_vbit_in_pfn:
2290 e1 = cp_build_binary_op (BIT_AND_EXPR, idx, integer_one_node);
2291 idx = cp_build_binary_op (MINUS_EXPR, idx, integer_one_node);
2294 case ptrmemfunc_vbit_in_delta:
2295 e1 = cp_build_binary_op (BIT_AND_EXPR, delta, integer_one_node);
2296 delta = cp_build_binary_op (RSHIFT_EXPR, delta, integer_one_node);
2303 /* Convert down to the right base before using the instance. First
2305 basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (fntype));
2306 basetype = lookup_base (TREE_TYPE (TREE_TYPE (instance_ptr)),
2307 basetype, ba_check, NULL);
2308 instance_ptr = build_base_path (PLUS_EXPR, instance_ptr, basetype, 1);
2309 if (instance_ptr == error_mark_node)
2310 return error_mark_node;
2311 /* ...and then the delta in the PMF. */
2312 instance_ptr = build (PLUS_EXPR, TREE_TYPE (instance_ptr),
2313 instance_ptr, delta);
2315 /* Hand back the adjusted 'this' argument to our caller. */
2316 *instance_ptrptr = instance_ptr;
2318 /* Next extract the vtable pointer from the object. */
2319 vtbl = build1 (NOP_EXPR, build_pointer_type (vtbl_ptr_type_node),
2321 vtbl = build_indirect_ref (vtbl, NULL);
2323 /* Finally, extract the function pointer from the vtable. */
2324 e2 = fold (build (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, idx));
2325 e2 = build_indirect_ref (e2, NULL);
2326 TREE_CONSTANT (e2) = 1;
2328 /* When using function descriptors, the address of the
2329 vtable entry is treated as a function pointer. */
2330 if (TARGET_VTABLE_USES_DESCRIPTORS)
2331 e2 = build1 (NOP_EXPR, TREE_TYPE (e2),
2332 build_unary_op (ADDR_EXPR, e2, /*noconvert=*/1));
2334 TREE_TYPE (e2) = TREE_TYPE (e3);
2335 e1 = build_conditional_expr (e1, e2, e3);
2337 /* Make sure this doesn't get evaluated first inside one of the
2338 branches of the COND_EXPR. */
2339 if (instance_save_expr)
2340 e1 = build (COMPOUND_EXPR, TREE_TYPE (e1),
2341 instance_save_expr, e1);
2349 build_function_call (tree function, tree params)
2351 register tree fntype, fndecl;
2352 register tree coerced_params;
2354 tree name = NULL_TREE, assembler_name = NULL_TREE;
2356 tree original = function;
2358 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
2359 Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */
2360 if (TREE_CODE (function) == NOP_EXPR
2361 && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0)))
2362 function = TREE_OPERAND (function, 0);
2364 if (TREE_CODE (function) == FUNCTION_DECL)
2366 name = DECL_NAME (function);
2367 assembler_name = DECL_ASSEMBLER_NAME (function);
2369 mark_used (function);
2372 /* Convert anything with function type to a pointer-to-function. */
2373 if (pedantic && DECL_MAIN_P (function))
2374 pedwarn ("ISO C++ forbids calling `::main' from within program");
2376 /* Differs from default_conversion by not setting TREE_ADDRESSABLE
2377 (because calling an inline function does not mean the function
2378 needs to be separately compiled). */
2380 if (DECL_INLINE (function))
2381 function = inline_conversion (function);
2383 function = build_addr_func (function);
2389 function = build_addr_func (function);
2392 if (function == error_mark_node)
2393 return error_mark_node;
2395 fntype = TREE_TYPE (function);
2397 if (TYPE_PTRMEMFUNC_P (fntype))
2399 error ("must use .* or ->* to call pointer-to-member function in `%E (...)'",
2401 return error_mark_node;
2404 is_method = (TREE_CODE (fntype) == POINTER_TYPE
2405 && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE);
2407 if (!((TREE_CODE (fntype) == POINTER_TYPE
2408 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)
2410 || TREE_CODE (function) == TEMPLATE_ID_EXPR))
2412 error ("`%E' cannot be used as a function", original);
2413 return error_mark_node;
2416 /* fntype now gets the type of function pointed to. */
2417 fntype = TREE_TYPE (fntype);
2419 /* Convert the parameters to the types declared in the
2420 function prototype, or apply default promotions. */
2422 coerced_params = convert_arguments (TYPE_ARG_TYPES (fntype),
2423 params, fndecl, LOOKUP_NORMAL);
2424 if (coerced_params == error_mark_node)
2425 return error_mark_node;
2427 /* Check for errors in format strings. */
2430 check_function_format (NULL, TYPE_ATTRIBUTES (fntype), coerced_params);
2432 /* Recognize certain built-in functions so we can make tree-codes
2433 other than CALL_EXPR. We do this when it enables fold-const.c
2434 to do something useful. */
2436 if (TREE_CODE (function) == ADDR_EXPR
2437 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
2438 && DECL_BUILT_IN (TREE_OPERAND (function, 0)))
2440 result = expand_tree_builtin (TREE_OPERAND (function, 0),
2441 params, coerced_params);
2446 return build_cxx_call (function, params, coerced_params);
2449 /* Convert the actual parameter expressions in the list VALUES
2450 to the types in the list TYPELIST.
2451 If parmdecls is exhausted, or when an element has NULL as its type,
2452 perform the default conversions.
2454 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
2456 This is also where warnings about wrong number of args are generated.
2458 Return a list of expressions for the parameters as converted.
2460 Both VALUES and the returned value are chains of TREE_LIST nodes
2461 with the elements of the list in the TREE_VALUE slots of those nodes.
2463 In C++, unspecified trailing parameters can be filled in with their
2464 default arguments, if such were specified. Do so here. */
2467 convert_arguments (tree typelist, tree values, tree fndecl, int flags)
2469 register tree typetail, valtail;
2470 register tree result = NULL_TREE;
2471 const char *called_thing = 0;
2474 /* Argument passing is always copy-initialization. */
2475 flags |= LOOKUP_ONLYCONVERTING;
2479 if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE)
2481 if (DECL_NAME (fndecl) == NULL_TREE
2482 || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl)))
2483 called_thing = "constructor";
2485 called_thing = "member function";
2488 called_thing = "function";
2491 for (valtail = values, typetail = typelist;
2493 valtail = TREE_CHAIN (valtail), i++)
2495 register tree type = typetail ? TREE_VALUE (typetail) : 0;
2496 register tree val = TREE_VALUE (valtail);
2498 if (val == error_mark_node)
2499 return error_mark_node;
2501 if (type == void_type_node)
2505 cp_error_at ("too many arguments to %s `%+#D'", called_thing,
2507 error ("at this point in file");
2510 error ("too many arguments to function");
2511 /* In case anybody wants to know if this argument
2514 TREE_TYPE (tree_last (result)) = error_mark_node;
2518 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
2519 Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */
2520 if (TREE_CODE (val) == NOP_EXPR
2521 && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0))
2522 && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE))
2523 val = TREE_OPERAND (val, 0);
2525 if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)
2527 if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE
2528 || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE
2529 || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE)
2530 val = decay_conversion (val);
2533 if (val == error_mark_node)
2534 return error_mark_node;
2538 /* Formal parm type is specified by a function prototype. */
2541 if (!COMPLETE_TYPE_P (complete_type (type)))
2544 error ("parameter %P of `%D' has incomplete type `%T'",
2547 error ("parameter %P has incomplete type `%T'", i, type);
2548 parmval = error_mark_node;
2552 parmval = convert_for_initialization
2553 (NULL_TREE, type, val, flags,
2554 "argument passing", fndecl, i);
2555 parmval = convert_for_arg_passing (type, parmval);
2558 if (parmval == error_mark_node)
2559 return error_mark_node;
2561 result = tree_cons (NULL_TREE, parmval, result);
2565 if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE)
2566 val = convert_from_reference (val);
2568 if (fndecl && DECL_BUILT_IN (fndecl)
2569 && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CONSTANT_P)
2570 /* Don't do ellipsis conversion for __built_in_constant_p
2571 as this will result in spurious warnings for non-POD
2573 val = require_complete_type (val);
2575 val = convert_arg_to_ellipsis (val);
2577 result = tree_cons (NULL_TREE, val, result);
2581 typetail = TREE_CHAIN (typetail);
2584 if (typetail != 0 && typetail != void_list_node)
2586 /* See if there are default arguments that can be used */
2587 if (TREE_PURPOSE (typetail)
2588 && TREE_CODE (TREE_PURPOSE (typetail)) != DEFAULT_ARG)
2590 for (; typetail != void_list_node; ++i)
2593 = convert_default_arg (TREE_VALUE (typetail),
2594 TREE_PURPOSE (typetail),
2597 if (parmval == error_mark_node)
2598 return error_mark_node;
2600 result = tree_cons (0, parmval, result);
2601 typetail = TREE_CHAIN (typetail);
2602 /* ends with `...'. */
2603 if (typetail == NULL_TREE)
2611 cp_error_at ("too few arguments to %s `%+#D'",
2612 called_thing, fndecl);
2613 error ("at this point in file");
2616 error ("too few arguments to function");
2617 return error_mark_list;
2621 return nreverse (result);
2624 /* Build a binary-operation expression, after performing default
2625 conversions on the operands. CODE is the kind of expression to build. */
2628 build_x_binary_op (enum tree_code code, tree arg1, tree arg2)
2637 if (processing_template_decl)
2639 if (type_dependent_expression_p (arg1)
2640 || type_dependent_expression_p (arg2))
2641 return build_min_nt (code, arg1, arg2);
2642 arg1 = build_non_dependent_expr (arg1);
2643 arg2 = build_non_dependent_expr (arg2);
2646 if (code == DOTSTAR_EXPR)
2647 expr = build_m_component_ref (arg1, arg2);
2649 expr = build_new_op (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE);
2651 if (processing_template_decl && expr != error_mark_node)
2652 return build_min_non_dep (code, expr, orig_arg1, orig_arg2);
2657 /* Build a binary-operation expression without default conversions.
2658 CODE is the kind of expression to build.
2659 This function differs from `build' in several ways:
2660 the data type of the result is computed and recorded in it,
2661 warnings are generated if arg data types are invalid,
2662 special handling for addition and subtraction of pointers is known,
2663 and some optimization is done (operations on narrow ints
2664 are done in the narrower type when that gives the same result).
2665 Constant folding is also done before the result is returned.
2667 Note that the operands will never have enumeral types
2668 because either they have just had the default conversions performed
2669 or they have both just been converted to some other type in which
2670 the arithmetic is to be done.
2672 C++: must do special pointer arithmetic when implementing
2673 multiple inheritance, and deal with pointer to member functions. */
2676 build_binary_op (enum tree_code code, tree orig_op0, tree orig_op1,
2677 int convert_p ATTRIBUTE_UNUSED)
2680 register enum tree_code code0, code1;
2683 /* Expression code to give to the expression when it is built.
2684 Normally this is CODE, which is what the caller asked for,
2685 but in some special cases we change it. */
2686 register enum tree_code resultcode = code;
2688 /* Data type in which the computation is to be performed.
2689 In the simplest cases this is the common type of the arguments. */
2690 register tree result_type = NULL;
2692 /* Nonzero means operands have already been type-converted
2693 in whatever way is necessary.
2694 Zero means they need to be converted to RESULT_TYPE. */
2697 /* Nonzero means create the expression with this type, rather than
2699 tree build_type = 0;
2701 /* Nonzero means after finally constructing the expression
2702 convert it to this type. */
2703 tree final_type = 0;
2705 /* Nonzero if this is an operation like MIN or MAX which can
2706 safely be computed in short if both args are promoted shorts.
2707 Also implies COMMON.
2708 -1 indicates a bitwise operation; this makes a difference
2709 in the exact conditions for when it is safe to do the operation
2710 in a narrower mode. */
2713 /* Nonzero if this is a comparison operation;
2714 if both args are promoted shorts, compare the original shorts.
2715 Also implies COMMON. */
2716 int short_compare = 0;
2718 /* Nonzero if this is a right-shift operation, which can be computed on the
2719 original short and then promoted if the operand is a promoted short. */
2720 int short_shift = 0;
2722 /* Nonzero means set RESULT_TYPE to the common type of the args. */
2725 /* Apply default conversions. */
2729 if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR
2730 || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR
2731 || code == TRUTH_XOR_EXPR)
2733 if (!really_overloaded_fn (op0))
2734 op0 = decay_conversion (op0);
2735 if (!really_overloaded_fn (op1))
2736 op1 = decay_conversion (op1);
2740 if (!really_overloaded_fn (op0))
2741 op0 = default_conversion (op0);
2742 if (!really_overloaded_fn (op1))
2743 op1 = default_conversion (op1);
2746 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
2747 STRIP_TYPE_NOPS (op0);
2748 STRIP_TYPE_NOPS (op1);
2750 /* DTRT if one side is an overloaded function, but complain about it. */
2751 if (type_unknown_p (op0))
2753 tree t = instantiate_type (TREE_TYPE (op1), op0, tf_none);
2754 if (t != error_mark_node)
2756 pedwarn ("assuming cast to type `%T' from overloaded function",
2761 if (type_unknown_p (op1))
2763 tree t = instantiate_type (TREE_TYPE (op0), op1, tf_none);
2764 if (t != error_mark_node)
2766 pedwarn ("assuming cast to type `%T' from overloaded function",
2772 type0 = TREE_TYPE (op0);
2773 type1 = TREE_TYPE (op1);
2775 /* The expression codes of the data types of the arguments tell us
2776 whether the arguments are integers, floating, pointers, etc. */
2777 code0 = TREE_CODE (type0);
2778 code1 = TREE_CODE (type1);
2780 /* If an error was already reported for one of the arguments,
2781 avoid reporting another error. */
2783 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
2784 return error_mark_node;
2789 /* Handle the pointer + int case. */
2790 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2791 return cp_pointer_int_sum (PLUS_EXPR, op0, op1);
2792 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
2793 return cp_pointer_int_sum (PLUS_EXPR, op1, op0);
2799 /* Subtraction of two similar pointers.
2800 We must subtract them as integers, then divide by object size. */
2801 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
2802 && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type0),
2804 return pointer_diff (op0, op1, common_type (type0, type1));
2805 /* Handle pointer minus int. Just like pointer plus int. */
2806 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2807 return cp_pointer_int_sum (MINUS_EXPR, op0, op1);
2816 case TRUNC_DIV_EXPR:
2818 case FLOOR_DIV_EXPR:
2819 case ROUND_DIV_EXPR:
2820 case EXACT_DIV_EXPR:
2821 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2822 || code0 == COMPLEX_TYPE)
2823 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2824 || code1 == COMPLEX_TYPE))
2826 if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1))
2827 warning ("division by zero in `%E / 0'", op0);
2828 else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1))
2829 warning ("division by zero in `%E / 0.'", op0);
2831 if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
2832 resultcode = RDIV_EXPR;
2834 /* When dividing two signed integers, we have to promote to int.
2835 unless we divide by a constant != -1. Note that default
2836 conversion will have been performed on the operands at this
2837 point, so we have to dig out the original type to find out if
2839 shorten = ((TREE_CODE (op0) == NOP_EXPR
2840 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0))))
2841 || (TREE_CODE (op1) == INTEGER_CST
2842 && ! integer_all_onesp (op1)));
2851 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2855 case TRUNC_MOD_EXPR:
2856 case FLOOR_MOD_EXPR:
2857 if (code1 == INTEGER_TYPE && integer_zerop (op1))
2858 warning ("division by zero in `%E %% 0'", op0);
2859 else if (code1 == REAL_TYPE && real_zerop (op1))
2860 warning ("division by zero in `%E %% 0.'", op0);
2862 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2864 /* Although it would be tempting to shorten always here, that loses
2865 on some targets, since the modulo instruction is undefined if the
2866 quotient can't be represented in the computation mode. We shorten
2867 only if unsigned or if dividing by something we know != -1. */
2868 shorten = ((TREE_CODE (op0) == NOP_EXPR
2869 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0))))
2870 || (TREE_CODE (op1) == INTEGER_CST
2871 && ! integer_all_onesp (op1)));
2876 case TRUTH_ANDIF_EXPR:
2877 case TRUTH_ORIF_EXPR:
2878 case TRUTH_AND_EXPR:
2880 result_type = boolean_type_node;
2883 /* Shift operations: result has same type as first operand;
2884 always convert second operand to int.
2885 Also set SHORT_SHIFT if shifting rightward. */
2888 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2890 result_type = type0;
2891 if (TREE_CODE (op1) == INTEGER_CST)
2893 if (tree_int_cst_lt (op1, integer_zero_node))
2894 warning ("right shift count is negative");
2897 if (! integer_zerop (op1))
2899 if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2900 warning ("right shift count >= width of type");
2903 /* Convert the shift-count to an integer, regardless of
2904 size of value being shifted. */
2905 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2906 op1 = cp_convert (integer_type_node, op1);
2907 /* Avoid converting op1 to result_type later. */
2913 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2915 result_type = type0;
2916 if (TREE_CODE (op1) == INTEGER_CST)
2918 if (tree_int_cst_lt (op1, integer_zero_node))
2919 warning ("left shift count is negative");
2920 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2921 warning ("left shift count >= width of type");
2923 /* Convert the shift-count to an integer, regardless of
2924 size of value being shifted. */
2925 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2926 op1 = cp_convert (integer_type_node, op1);
2927 /* Avoid converting op1 to result_type later. */
2934 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2936 result_type = type0;
2937 if (TREE_CODE (op1) == INTEGER_CST)
2939 if (tree_int_cst_lt (op1, integer_zero_node))
2940 warning ("%s rotate count is negative",
2941 (code == LROTATE_EXPR) ? "left" : "right");
2942 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2943 warning ("%s rotate count >= width of type",
2944 (code == LROTATE_EXPR) ? "left" : "right");
2946 /* Convert the shift-count to an integer, regardless of
2947 size of value being shifted. */
2948 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2949 op1 = cp_convert (integer_type_node, op1);
2955 if (warn_float_equal && (code0 == REAL_TYPE || code1 == REAL_TYPE))
2956 warning ("comparing floating point with == or != is unsafe");
2958 build_type = boolean_type_node;
2959 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2960 || code0 == COMPLEX_TYPE)
2961 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2962 || code1 == COMPLEX_TYPE))
2964 else if ((code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2965 || (TYPE_PTRMEM_P (type0) && TYPE_PTRMEM_P (type1)))
2966 result_type = composite_pointer_type (type0, type1, op0, op1,
2968 else if ((code0 == POINTER_TYPE || TYPE_PTRMEM_P (type0))
2969 && null_ptr_cst_p (op1))
2970 result_type = type0;
2971 else if ((code1 == POINTER_TYPE || TYPE_PTRMEM_P (type1))
2972 && null_ptr_cst_p (op0))
2973 result_type = type1;
2974 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2976 result_type = type0;
2977 error ("ISO C++ forbids comparison between pointer and integer");
2979 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2981 result_type = type1;
2982 error ("ISO C++ forbids comparison between pointer and integer");
2984 else if (TYPE_PTRMEMFUNC_P (type0) && null_ptr_cst_p (op1))
2986 op0 = build_ptrmemfunc_access_expr (op0, pfn_identifier);
2987 op1 = cp_convert (TREE_TYPE (op0), integer_zero_node);
2988 result_type = TREE_TYPE (op0);
2990 else if (TYPE_PTRMEMFUNC_P (type1) && null_ptr_cst_p (op0))
2991 return cp_build_binary_op (code, op1, op0);
2992 else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1)
2993 && same_type_p (type0, type1))
2995 /* E will be the final comparison. */
2997 /* E1 and E2 are for scratch. */
3005 if (TREE_SIDE_EFFECTS (op0))
3006 op0 = save_expr (op0);
3007 if (TREE_SIDE_EFFECTS (op1))
3008 op1 = save_expr (op1);
3013 && (!op0.pfn || op0.delta == op1.delta))
3015 The reason for the `!op0.pfn' bit is that a NULL
3016 pointer-to-member is any member with a zero PFN; the
3017 DELTA field is unspecified. */
3018 pfn0 = pfn_from_ptrmemfunc (op0);
3019 pfn1 = pfn_from_ptrmemfunc (op1);
3020 delta0 = build_ptrmemfunc_access_expr (op0,
3022 delta1 = build_ptrmemfunc_access_expr (op1,
3024 e1 = cp_build_binary_op (EQ_EXPR, delta0, delta1);
3025 e2 = cp_build_binary_op (EQ_EXPR,
3027 cp_convert (TREE_TYPE (pfn0),
3028 integer_zero_node));
3029 e1 = cp_build_binary_op (TRUTH_ORIF_EXPR, e1, e2);
3030 e2 = build (EQ_EXPR, boolean_type_node, pfn0, pfn1);
3031 e = cp_build_binary_op (TRUTH_ANDIF_EXPR, e2, e1);
3032 if (code == EQ_EXPR)
3034 return cp_build_binary_op (EQ_EXPR, e, integer_zero_node);
3036 else if ((TYPE_PTRMEMFUNC_P (type0)
3037 && same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type0), type1))
3038 || (TYPE_PTRMEMFUNC_P (type1)
3039 && same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type1), type0)))
3045 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
3046 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
3048 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
3049 result_type = composite_pointer_type (type0, type1, op0, op1,
3057 build_type = boolean_type_node;
3058 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
3059 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
3061 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
3062 result_type = composite_pointer_type (type0, type1, op0, op1,
3064 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
3065 && integer_zerop (op1))
3066 result_type = type0;
3067 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
3068 && integer_zerop (op0))
3069 result_type = type1;
3070 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
3072 result_type = type0;
3073 pedwarn ("ISO C++ forbids comparison between pointer and integer");
3075 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
3077 result_type = type1;
3078 pedwarn ("ISO C++ forbids comparison between pointer and integer");
3082 case UNORDERED_EXPR:
3089 build_type = integer_type_node;
3090 if (code0 != REAL_TYPE || code1 != REAL_TYPE)
3092 error ("unordered comparison on non-floating point argument");
3093 return error_mark_node;
3102 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
3104 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
3106 int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
3108 if (shorten || common || short_compare)
3109 result_type = common_type (type0, type1);
3111 /* For certain operations (which identify themselves by shorten != 0)
3112 if both args were extended from the same smaller type,
3113 do the arithmetic in that type and then extend.
3115 shorten !=0 and !=1 indicates a bitwise operation.
3116 For them, this optimization is safe only if
3117 both args are zero-extended or both are sign-extended.
3118 Otherwise, we might change the result.
3119 Eg, (short)-1 | (unsigned short)-1 is (int)-1
3120 but calculated in (unsigned short) it would be (unsigned short)-1. */
3122 if (shorten && none_complex)
3124 int unsigned0, unsigned1;
3125 tree arg0 = get_narrower (op0, &unsigned0);
3126 tree arg1 = get_narrower (op1, &unsigned1);
3127 /* UNS is 1 if the operation to be done is an unsigned one. */
3128 int uns = TREE_UNSIGNED (result_type);
3131 final_type = result_type;
3133 /* Handle the case that OP0 does not *contain* a conversion
3134 but it *requires* conversion to FINAL_TYPE. */
3136 if (op0 == arg0 && TREE_TYPE (op0) != final_type)
3137 unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0));
3138 if (op1 == arg1 && TREE_TYPE (op1) != final_type)
3139 unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1));
3141 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
3143 /* For bitwise operations, signedness of nominal type
3144 does not matter. Consider only how operands were extended. */
3148 /* Note that in all three cases below we refrain from optimizing
3149 an unsigned operation on sign-extended args.
3150 That would not be valid. */
3152 /* Both args variable: if both extended in same way
3153 from same width, do it in that width.
3154 Do it unsigned if args were zero-extended. */
3155 if ((TYPE_PRECISION (TREE_TYPE (arg0))
3156 < TYPE_PRECISION (result_type))
3157 && (TYPE_PRECISION (TREE_TYPE (arg1))
3158 == TYPE_PRECISION (TREE_TYPE (arg0)))
3159 && unsigned0 == unsigned1
3160 && (unsigned0 || !uns))
3161 result_type = c_common_signed_or_unsigned_type
3162 (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
3163 else if (TREE_CODE (arg0) == INTEGER_CST
3164 && (unsigned1 || !uns)
3165 && (TYPE_PRECISION (TREE_TYPE (arg1))
3166 < TYPE_PRECISION (result_type))
3167 && (type = c_common_signed_or_unsigned_type
3168 (unsigned1, TREE_TYPE (arg1)),
3169 int_fits_type_p (arg0, type)))
3171 else if (TREE_CODE (arg1) == INTEGER_CST
3172 && (unsigned0 || !uns)
3173 && (TYPE_PRECISION (TREE_TYPE (arg0))
3174 < TYPE_PRECISION (result_type))
3175 && (type = c_common_signed_or_unsigned_type
3176 (unsigned0, TREE_TYPE (arg0)),
3177 int_fits_type_p (arg1, type)))
3181 /* Shifts can be shortened if shifting right. */
3186 tree arg0 = get_narrower (op0, &unsigned_arg);
3188 final_type = result_type;
3190 if (arg0 == op0 && final_type == TREE_TYPE (op0))
3191 unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0));
3193 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
3194 /* We can shorten only if the shift count is less than the
3195 number of bits in the smaller type size. */
3196 && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
3197 /* If arg is sign-extended and then unsigned-shifted,
3198 we can simulate this with a signed shift in arg's type
3199 only if the extended result is at least twice as wide
3200 as the arg. Otherwise, the shift could use up all the
3201 ones made by sign-extension and bring in zeros.
3202 We can't optimize that case at all, but in most machines
3203 it never happens because available widths are 2**N. */
3204 && (!TREE_UNSIGNED (final_type)
3206 || (((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0)))
3207 <= TYPE_PRECISION (result_type))))
3209 /* Do an unsigned shift if the operand was zero-extended. */
3211 = c_common_signed_or_unsigned_type (unsigned_arg,
3213 /* Convert value-to-be-shifted to that type. */
3214 if (TREE_TYPE (op0) != result_type)
3215 op0 = cp_convert (result_type, op0);
3220 /* Comparison operations are shortened too but differently.
3221 They identify themselves by setting short_compare = 1. */
3225 /* Don't write &op0, etc., because that would prevent op0
3226 from being kept in a register.
3227 Instead, make copies of the our local variables and
3228 pass the copies by reference, then copy them back afterward. */
3229 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
3230 enum tree_code xresultcode = resultcode;
3232 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
3234 return cp_convert (boolean_type_node, val);
3235 op0 = xop0, op1 = xop1;
3237 resultcode = xresultcode;
3240 if ((short_compare || code == MIN_EXPR || code == MAX_EXPR)
3241 && warn_sign_compare
3242 /* Do not warn until the template is instantiated; we cannot
3243 bound the ranges of the arguments until that point. */
3244 && !processing_template_decl)
3246 int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0));
3247 int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1));
3249 int unsignedp0, unsignedp1;
3250 tree primop0 = get_narrower (op0, &unsignedp0);
3251 tree primop1 = get_narrower (op1, &unsignedp1);
3253 /* Check for comparison of different enum types. */
3254 if (TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE
3255 && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE
3256 && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0))
3257 != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1)))
3259 warning ("comparison between types `%#T' and `%#T'",
3260 TREE_TYPE (orig_op0), TREE_TYPE (orig_op1));
3263 /* Give warnings for comparisons between signed and unsigned
3264 quantities that may fail. */
3265 /* Do the checking based on the original operand trees, so that
3266 casts will be considered, but default promotions won't be. */
3268 /* Do not warn if the comparison is being done in a signed type,
3269 since the signed type will only be chosen if it can represent
3270 all the values of the unsigned type. */
3271 if (! TREE_UNSIGNED (result_type))
3273 /* Do not warn if both operands are unsigned. */
3274 else if (op0_signed == op1_signed)
3276 /* Do not warn if the signed quantity is an unsuffixed
3277 integer literal (or some static constant expression
3278 involving such literals or a conditional expression
3279 involving such literals) and it is non-negative. */
3280 else if ((op0_signed && tree_expr_nonnegative_p (orig_op0))
3281 || (op1_signed && tree_expr_nonnegative_p (orig_op1)))
3283 /* Do not warn if the comparison is an equality operation,
3284 the unsigned quantity is an integral constant and it does
3285 not use the most significant bit of result_type. */
3286 else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR)
3287 && ((op0_signed && TREE_CODE (orig_op1) == INTEGER_CST
3288 && int_fits_type_p (orig_op1, c_common_signed_type
3290 || (op1_signed && TREE_CODE (orig_op0) == INTEGER_CST
3291 && int_fits_type_p (orig_op0, c_common_signed_type
3295 warning ("comparison between signed and unsigned integer expressions");
3297 /* Warn if two unsigned values are being compared in a size
3298 larger than their original size, and one (and only one) is the
3299 result of a `~' operator. This comparison will always fail.
3301 Also warn if one operand is a constant, and the constant does not
3302 have all bits set that are set in the ~ operand when it is
3305 if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
3306 ^ (TREE_CODE (primop1) == BIT_NOT_EXPR))
3308 if (TREE_CODE (primop0) == BIT_NOT_EXPR)
3309 primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0);
3310 if (TREE_CODE (primop1) == BIT_NOT_EXPR)
3311 primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1);
3313 if (host_integerp (primop0, 0) || host_integerp (primop1, 0))
3316 HOST_WIDE_INT constant, mask;
3320 if (host_integerp (primop0, 0))
3323 unsignedp = unsignedp1;
3324 constant = tree_low_cst (primop0, 0);
3329 unsignedp = unsignedp0;
3330 constant = tree_low_cst (primop1, 0);
3333 bits = TYPE_PRECISION (TREE_TYPE (primop));
3334 if (bits < TYPE_PRECISION (result_type)
3335 && bits < HOST_BITS_PER_LONG && unsignedp)
3337 mask = (~ (HOST_WIDE_INT) 0) << bits;
3338 if ((mask & constant) != mask)
3339 warning ("comparison of promoted ~unsigned with constant");
3342 else if (unsignedp0 && unsignedp1
3343 && (TYPE_PRECISION (TREE_TYPE (primop0))
3344 < TYPE_PRECISION (result_type))
3345 && (TYPE_PRECISION (TREE_TYPE (primop1))
3346 < TYPE_PRECISION (result_type)))
3347 warning ("comparison of promoted ~unsigned with unsigned");
3352 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
3353 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
3354 Then the expression will be built.
3355 It will be given type FINAL_TYPE if that is nonzero;
3356 otherwise, it will be given type RESULT_TYPE. */
3360 error ("invalid operands of types `%T' and `%T' to binary `%O'",
3361 TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), code);
3362 return error_mark_node;
3365 /* Issue warnings about peculiar, but valid, uses of NULL. */
3366 if (/* It's reasonable to use pointer values as operands of &&
3367 and ||, so NULL is no exception. */
3368 !(code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)
3369 && (/* If OP0 is NULL and OP1 is not a pointer, or vice versa. */
3370 (orig_op0 == null_node
3371 && TREE_CODE (TREE_TYPE (op1)) != POINTER_TYPE)
3372 /* Or vice versa. */
3373 || (orig_op1 == null_node
3374 && TREE_CODE (TREE_TYPE (op0)) != POINTER_TYPE)
3375 /* Or, both are NULL and the operation was not a comparison. */
3376 || (orig_op0 == null_node && orig_op1 == null_node
3377 && code != EQ_EXPR && code != NE_EXPR)))
3378 /* Some sort of arithmetic operation involving NULL was
3379 performed. Note that pointer-difference and pointer-addition
3380 have already been handled above, and so we don't end up here in
3382 warning ("NULL used in arithmetic");
3386 if (TREE_TYPE (op0) != result_type)
3387 op0 = cp_convert (result_type, op0);
3388 if (TREE_TYPE (op1) != result_type)
3389 op1 = cp_convert (result_type, op1);
3391 if (op0 == error_mark_node || op1 == error_mark_node)
3392 return error_mark_node;
3395 if (build_type == NULL_TREE)
3396 build_type = result_type;
3399 register tree result = build (resultcode, build_type, op0, op1);
3400 register tree folded;
3402 folded = fold (result);
3403 if (folded == result)
3404 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
3405 if (final_type != 0)
3406 return cp_convert (final_type, folded);
3411 /* Return a tree for the sum or difference (RESULTCODE says which)
3412 of pointer PTROP and integer INTOP. */
3415 cp_pointer_int_sum (enum tree_code resultcode, register tree ptrop,
3416 register tree intop)
3418 tree res_type = TREE_TYPE (ptrop);
3420 /* pointer_int_sum() uses size_in_bytes() on the TREE_TYPE(res_type)
3421 in certain circumstance (when it's valid to do so). So we need
3422 to make sure it's complete. We don't need to check here, if we
3423 can actually complete it at all, as those checks will be done in
3424 pointer_int_sum() anyway. */
3425 complete_type (TREE_TYPE (res_type));
3427 return pointer_int_sum (resultcode, ptrop, fold (intop));
3430 /* Return a tree for the difference of pointers OP0 and OP1.
3431 The resulting tree has type int. */
3434 pointer_diff (register tree op0, register tree op1, register tree ptrtype)
3436 register tree result, folded;
3437 tree restype = ptrdiff_type_node;
3438 tree target_type = TREE_TYPE (ptrtype);
3440 if (!complete_type_or_else (target_type, NULL_TREE))
3441 return error_mark_node;
3443 if (pedantic || warn_pointer_arith)
3445 if (TREE_CODE (target_type) == VOID_TYPE)
3446 pedwarn ("ISO C++ forbids using pointer of type `void *' in subtraction");
3447 if (TREE_CODE (target_type) == FUNCTION_TYPE)
3448 pedwarn ("ISO C++ forbids using pointer to a function in subtraction");
3449 if (TREE_CODE (target_type) == METHOD_TYPE)
3450 pedwarn ("ISO C++ forbids using pointer to a method in subtraction");
3453 /* First do the subtraction as integers;
3454 then drop through to build the divide operator. */
3456 op0 = cp_build_binary_op (MINUS_EXPR,
3457 cp_convert (restype, op0),
3458 cp_convert (restype, op1));
3460 /* This generates an error if op1 is a pointer to an incomplete type. */
3461 if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (op1))))
3462 error ("invalid use of a pointer to an incomplete type in pointer arithmetic");
3464 op1 = (TYPE_PTROB_P (ptrtype)
3465 ? size_in_bytes (target_type)
3466 : integer_one_node);
3468 /* Do the division. */
3470 result = build (EXACT_DIV_EXPR, restype, op0, cp_convert (restype, op1));
3472 folded = fold (result);
3473 if (folded == result)
3474 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
3478 /* Construct and perhaps optimize a tree representation
3479 for a unary operation. CODE, a tree_code, specifies the operation
3480 and XARG is the operand. */
3483 build_x_unary_op (enum tree_code code, tree xarg)
3485 tree orig_expr = xarg;
3489 if (processing_template_decl)
3491 if (type_dependent_expression_p (xarg))
3492 return build_min_nt (code, xarg, NULL_TREE);
3493 xarg = build_non_dependent_expr (xarg);
3498 /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an
3500 if (code == ADDR_EXPR
3501 && TREE_CODE (xarg) != TEMPLATE_ID_EXPR
3502 && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg)))
3503 && !COMPLETE_TYPE_P (TREE_TYPE (xarg)))
3504 || (TREE_CODE (xarg) == OFFSET_REF)))
3505 /* don't look for a function */;
3507 exp = build_new_op (code, LOOKUP_NORMAL, xarg, NULL_TREE, NULL_TREE);
3508 if (!exp && code == ADDR_EXPR)
3510 /* A pointer to member-function can be formed only by saying
3512 if (!flag_ms_extensions && TREE_CODE (TREE_TYPE (xarg)) == METHOD_TYPE
3513 && (TREE_CODE (xarg) != OFFSET_REF || !PTRMEM_OK_P (xarg)))
3515 if (TREE_CODE (xarg) != OFFSET_REF)
3517 error ("invalid use of '%E' to form a pointer-to-member-function. Use a qualified-id.",
3519 return error_mark_node;
3523 error ("parenthesis around '%E' cannot be used to form a pointer-to-member-function",
3525 PTRMEM_OK_P (xarg) = 1;
3529 if (TREE_CODE (xarg) == OFFSET_REF)
3531 ptrmem = PTRMEM_OK_P (xarg);
3533 if (!ptrmem && !flag_ms_extensions
3534 && TREE_CODE (TREE_TYPE (TREE_OPERAND (xarg, 1))) == METHOD_TYPE)
3536 /* A single non-static member, make sure we don't allow a
3537 pointer-to-member. */
3538 xarg = build (OFFSET_REF, TREE_TYPE (xarg),
3539 TREE_OPERAND (xarg, 0),
3540 ovl_cons (TREE_OPERAND (xarg, 1), NULL_TREE));
3541 PTRMEM_OK_P (xarg) = ptrmem;
3544 else if (TREE_CODE (xarg) == TARGET_EXPR)
3545 warning ("taking address of temporary");
3546 exp = build_unary_op (ADDR_EXPR, xarg, 0);
3547 if (TREE_CODE (exp) == ADDR_EXPR)
3548 PTRMEM_OK_P (exp) = ptrmem;
3551 if (processing_template_decl && exp != error_mark_node)
3552 return build_min_non_dep (code, exp, orig_expr,
3553 /*For {PRE,POST}{INC,DEC}REMENT_EXPR*/NULL_TREE);
3557 /* Like c_common_truthvalue_conversion, but handle pointer-to-member
3558 constants, where a null value is represented by an INTEGER_CST of
3562 cp_truthvalue_conversion (tree expr)
3564 tree type = TREE_TYPE (expr);
3565 if (TYPE_PTRMEM_P (type))
3566 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
3568 return c_common_truthvalue_conversion (expr);
3571 /* Just like cp_truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */
3574 condition_conversion (tree expr)
3577 if (processing_template_decl)
3579 t = perform_implicit_conversion (boolean_type_node, expr);
3580 t = fold (build1 (CLEANUP_POINT_EXPR, boolean_type_node, t));
3584 /* Return an ADDR_EXPR giving the address of T. This function
3585 attempts no optimizations or simplifications; it is a low-level
3589 build_address (tree t)
3593 if (error_operand_p (t) || !cxx_mark_addressable (t))
3594 return error_mark_node;
3596 addr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (t)), t);
3598 TREE_CONSTANT (addr) = 1;
3603 /* Return a NOP_EXPR converting EXPR to TYPE. */
3606 build_nop (tree type, tree expr)
3610 if (type == error_mark_node || error_operand_p (expr))
3613 nop = build1 (NOP_EXPR, type, expr);
3614 if (TREE_CONSTANT (expr))
3615 TREE_CONSTANT (nop) = 1;
3620 /* C++: Must handle pointers to members.
3622 Perhaps type instantiation should be extended to handle conversion
3623 from aggregates to types we don't yet know we want? (Or are those
3624 cases typically errors which should be reported?)
3626 NOCONVERT nonzero suppresses the default promotions
3627 (such as from short to int). */
3630 build_unary_op (enum tree_code code, tree xarg, int noconvert)
3632 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
3633 register tree arg = xarg;
3634 register tree argtype = 0;
3635 const char *errstring = NULL;
3638 if (arg == error_mark_node)
3639 return error_mark_node;
3644 /* This is used for unary plus, because a CONVERT_EXPR
3645 is enough to prevent anybody from looking inside for
3646 associativity, but won't generate any code. */
3647 if (!(arg = build_expr_type_conversion
3648 (WANT_ARITH | WANT_ENUM | WANT_POINTER, arg, true)))
3649 errstring = "wrong type argument to unary plus";
3653 arg = default_conversion (arg);
3654 arg = build1 (NON_LVALUE_EXPR, TREE_TYPE (arg), arg);
3655 TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0));
3660 if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, true)))
3661 errstring = "wrong type argument to unary minus";
3662 else if (!noconvert && CP_INTEGRAL_TYPE_P (TREE_TYPE (arg)))
3663 arg = perform_integral_promotions (arg);
3667 if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3671 arg = default_conversion (arg);
3673 else if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM,
3675 errstring = "wrong type argument to bit-complement";
3676 else if (!noconvert)
3677 arg = perform_integral_promotions (arg);
3681 if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, true)))
3682 errstring = "wrong type argument to abs";
3683 else if (!noconvert)
3684 arg = default_conversion (arg);
3688 /* Conjugating a real value is a no-op, but allow it anyway. */
3689 if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, true)))
3690 errstring = "wrong type argument to conjugation";
3691 else if (!noconvert)
3692 arg = default_conversion (arg);
3695 case TRUTH_NOT_EXPR:
3696 arg = perform_implicit_conversion (boolean_type_node, arg);
3697 val = invert_truthvalue (arg);
3698 if (arg != error_mark_node)
3700 errstring = "in argument to unary !";
3707 if (TREE_CODE (arg) == COMPLEX_CST)
3708 return TREE_REALPART (arg);
3709 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3710 return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
3715 if (TREE_CODE (arg) == COMPLEX_CST)
3716 return TREE_IMAGPART (arg);
3717 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3718 return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
3720 return cp_convert (TREE_TYPE (arg), integer_zero_node);
3722 case PREINCREMENT_EXPR:
3723 case POSTINCREMENT_EXPR:
3724 case PREDECREMENT_EXPR:
3725 case POSTDECREMENT_EXPR:
3726 /* Handle complex lvalues (when permitted)
3727 by reduction to simpler cases. */
3729 val = unary_complex_lvalue (code, arg);
3733 /* Increment or decrement the real part of the value,
3734 and don't change the imaginary part. */
3735 if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3739 arg = stabilize_reference (arg);
3740 real = build_unary_op (REALPART_EXPR, arg, 1);
3741 imag = build_unary_op (IMAGPART_EXPR, arg, 1);
3742 return build (COMPLEX_EXPR, TREE_TYPE (arg),
3743 build_unary_op (code, real, 1), imag);
3746 /* Report invalid types. */
3748 if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER,
3751 if (code == PREINCREMENT_EXPR)
3752 errstring ="no pre-increment operator for type";
3753 else if (code == POSTINCREMENT_EXPR)
3754 errstring ="no post-increment operator for type";
3755 else if (code == PREDECREMENT_EXPR)
3756 errstring ="no pre-decrement operator for type";
3758 errstring ="no post-decrement operator for type";
3762 /* Report something read-only. */
3764 if (CP_TYPE_CONST_P (TREE_TYPE (arg))
3765 || TREE_READONLY (arg))
3766 readonly_error (arg, ((code == PREINCREMENT_EXPR
3767 || code == POSTINCREMENT_EXPR)
3768 ? "increment" : "decrement"),
3773 tree result_type = TREE_TYPE (arg);
3775 arg = get_unwidened (arg, 0);
3776 argtype = TREE_TYPE (arg);
3778 /* ARM $5.2.5 last annotation says this should be forbidden. */
3779 if (TREE_CODE (argtype) == ENUMERAL_TYPE)
3780 pedwarn ("ISO C++ forbids %sing an enum",
3781 (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
3782 ? "increment" : "decrement");
3784 /* Compute the increment. */
3786 if (TREE_CODE (argtype) == POINTER_TYPE)
3788 tree type = complete_type (TREE_TYPE (argtype));
3790 if (!COMPLETE_OR_VOID_TYPE_P (type))
3791 error ("cannot %s a pointer to incomplete type `%T'",
3792 ((code == PREINCREMENT_EXPR
3793 || code == POSTINCREMENT_EXPR)
3794 ? "increment" : "decrement"), TREE_TYPE (argtype));
3795 else if ((pedantic || warn_pointer_arith)
3796 && !TYPE_PTROB_P (argtype))
3797 pedwarn ("ISO C++ forbids %sing a pointer of type `%T'",
3798 ((code == PREINCREMENT_EXPR
3799 || code == POSTINCREMENT_EXPR)
3800 ? "increment" : "decrement"), argtype);
3801 inc = cxx_sizeof_nowarn (TREE_TYPE (argtype));
3804 inc = integer_one_node;
3806 inc = cp_convert (argtype, inc);
3808 /* Handle incrementing a cast-expression. */
3810 switch (TREE_CODE (arg))
3815 case FIX_TRUNC_EXPR:
3816 case FIX_FLOOR_EXPR:
3817 case FIX_ROUND_EXPR:
3820 tree incremented, modify, value, compound;
3821 if (! lvalue_p (arg) && pedantic)
3822 pedwarn ("cast to non-reference type used as lvalue");
3823 arg = stabilize_reference (arg);
3824 if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR)
3827 value = save_expr (arg);
3828 incremented = build (((code == PREINCREMENT_EXPR
3829 || code == POSTINCREMENT_EXPR)
3830 ? PLUS_EXPR : MINUS_EXPR),
3831 argtype, value, inc);
3833 modify = build_modify_expr (arg, NOP_EXPR, incremented);
3834 compound = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value);
3836 /* Eliminate warning about unused result of + or -. */
3837 TREE_NO_UNUSED_WARNING (compound) = 1;
3845 /* Complain about anything else that is not a true lvalue. */
3846 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
3847 || code == POSTINCREMENT_EXPR)
3848 ? "increment" : "decrement")))
3849 return error_mark_node;
3851 /* Forbid using -- on `bool'. */
3852 if (TREE_TYPE (arg) == boolean_type_node)
3854 if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR)
3856 error ("invalid use of `--' on bool variable `%D'", arg);
3857 return error_mark_node;
3859 val = boolean_increment (code, arg);
3862 val = build (code, TREE_TYPE (arg), arg, inc);
3864 TREE_SIDE_EFFECTS (val) = 1;
3865 return cp_convert (result_type, val);
3869 /* Note that this operation never does default_conversion
3870 regardless of NOCONVERT. */
3872 argtype = lvalue_type (arg);
3874 if (TREE_CODE (arg) == OFFSET_REF)
3877 if (TREE_CODE (argtype) == REFERENCE_TYPE)
3881 build_pointer_type (TREE_TYPE (argtype)), arg);
3882 TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0));
3885 else if (pedantic && DECL_MAIN_P (arg))
3887 pedwarn ("ISO C++ forbids taking address of function `::main'");
3889 /* Let &* cancel out to simplify resulting code. */
3890 if (TREE_CODE (arg) == INDIRECT_REF)
3892 /* We don't need to have `current_class_ptr' wrapped in a
3893 NON_LVALUE_EXPR node. */
3894 if (arg == current_class_ref)
3895 return current_class_ptr;
3897 arg = TREE_OPERAND (arg, 0);
3898 if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE)
3902 build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg);
3903 TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0));
3905 else if (lvalue_p (arg))
3906 /* Don't let this be an lvalue. */
3907 return non_lvalue (arg);
3911 /* For &x[y], return x+y */
3912 if (TREE_CODE (arg) == ARRAY_REF)
3914 if (!cxx_mark_addressable (TREE_OPERAND (arg, 0)))
3915 return error_mark_node;
3916 return cp_build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
3917 TREE_OPERAND (arg, 1));
3920 /* Uninstantiated types are all functions. Taking the
3921 address of a function is a no-op, so just return the
3924 if (TREE_CODE (arg) == IDENTIFIER_NODE
3925 && IDENTIFIER_OPNAME_P (arg))
3928 /* We don't know the type yet, so just work around the problem.
3929 We know that this will resolve to an lvalue. */
3930 return build1 (ADDR_EXPR, unknown_type_node, arg);
3933 if (TREE_CODE (arg) == COMPONENT_REF && type_unknown_p (arg)
3934 && !really_overloaded_fn (TREE_OPERAND (arg, 1)))
3936 /* They're trying to take the address of a unique non-static
3937 member function. This is ill-formed (except in MS-land),
3938 but let's try to DTRT.
3939 Note: We only handle unique functions here because we don't
3940 want to complain if there's a static overload; non-unique
3941 cases will be handled by instantiate_type. But we need to
3942 handle this case here to allow casts on the resulting PMF.
3943 We could defer this in non-MS mode, but it's easier to give
3944 a useful error here. */
3946 /* Inside constant member functions, the `this' pointer
3947 contains an extra const qualifier. TYPE_MAIN_VARIANT
3948 is used here to remove this const from the diagnostics
3949 and the created OFFSET_REF. */
3950 tree base = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (arg, 0)));
3951 tree name = DECL_NAME (get_first_fn (TREE_OPERAND (arg, 1)));
3953 if (! flag_ms_extensions)
3955 if (current_class_type
3956 && TREE_OPERAND (arg, 0) == current_class_ref)
3957 /* An expression like &memfn. */
3958 pedwarn ("ISO C++ forbids taking the address of an unqualified"
3959 " or parenthesized non-static member function to form"
3960 " a pointer to member function. Say `&%T::%D'",
3963 pedwarn ("ISO C++ forbids taking the address of a bound member"
3964 " function to form a pointer to member function."
3968 arg = build_offset_ref (base, name, /*address_p=*/true);
3972 if (type_unknown_p (arg))
3973 return build1 (ADDR_EXPR, unknown_type_node, arg);
3975 /* Handle complex lvalues (when permitted)
3976 by reduction to simpler cases. */
3977 val = unary_complex_lvalue (code, arg);
3981 switch (TREE_CODE (arg))
3986 case FIX_TRUNC_EXPR:
3987 case FIX_FLOOR_EXPR:
3988 case FIX_ROUND_EXPR:
3990 if (! lvalue_p (arg) && pedantic)
3991 pedwarn ("ISO C++ forbids taking the address of a cast to a non-lvalue expression");
3998 /* Allow the address of a constructor if all the elements
4000 if (TREE_CODE (arg) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (arg)
4001 && TREE_CONSTANT (arg))
4003 /* Anything not already handled and not a true memory reference
4005 else if (TREE_CODE (argtype) != FUNCTION_TYPE
4006 && TREE_CODE (argtype) != METHOD_TYPE
4007 && !lvalue_or_else (arg, "unary `&'"))
4008 return error_mark_node;
4010 if (argtype != error_mark_node)
4011 argtype = build_pointer_type (argtype);
4016 if (TREE_CODE (arg) != COMPONENT_REF)
4017 addr = build_address (arg);
4018 else if (TREE_CODE (TREE_OPERAND (arg, 1)) == BASELINK)
4020 tree fn = BASELINK_FUNCTIONS (TREE_OPERAND (arg, 1));
4022 /* We can only get here with a single static member
4024 my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL
4025 && DECL_STATIC_FUNCTION_P (fn),
4028 addr = build_address (fn);
4029 if (TREE_SIDE_EFFECTS (TREE_OPERAND (arg, 0)))
4030 /* Do not lose object's side effects. */
4031 addr = build (COMPOUND_EXPR, TREE_TYPE (addr),
4032 TREE_OPERAND (arg, 0), addr);
4034 else if (DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1)))
4036 error ("attempt to take address of bit-field structure member `%D'",
4037 TREE_OPERAND (arg, 1));
4038 return error_mark_node;
4042 /* Unfortunately we cannot just build an address
4043 expression here, because we would not handle
4044 address-constant-expressions or offsetof correctly. */
4045 tree field = TREE_OPERAND (arg, 1);
4046 tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0);
4047 tree binfo = lookup_base (TREE_TYPE (TREE_TYPE (rval)),
4048 decl_type_context (field),
4051 rval = build_base_path (PLUS_EXPR, rval, binfo, 1);
4052 rval = build_nop (argtype, rval);
4053 addr = fold (build (PLUS_EXPR, argtype, rval,
4054 cp_convert (argtype, byte_position (field))));
4057 if (TREE_CODE (argtype) == POINTER_TYPE
4058 && TREE_CODE (TREE_TYPE (argtype)) == METHOD_TYPE)
4060 build_ptrmemfunc_type (argtype);
4061 addr = build_ptrmemfunc (argtype, addr, 0);
4074 argtype = TREE_TYPE (arg);
4075 return fold (build1 (code, argtype, arg));
4078 error ("%s", errstring);
4079 return error_mark_node;
4082 /* Apply unary lvalue-demanding operator CODE to the expression ARG
4083 for certain kinds of expressions which are not really lvalues
4084 but which we can accept as lvalues.
4086 If ARG is not a kind of expression we can handle, return zero. */
4089 unary_complex_lvalue (enum tree_code code, tree arg)
4091 /* Handle (a, b) used as an "lvalue". */
4092 if (TREE_CODE (arg) == COMPOUND_EXPR)
4094 tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0);
4095 return build (COMPOUND_EXPR, TREE_TYPE (real_result),
4096 TREE_OPERAND (arg, 0), real_result);
4099 /* Handle (a ? b : c) used as an "lvalue". */
4100 if (TREE_CODE (arg) == COND_EXPR
4101 || TREE_CODE (arg) == MIN_EXPR || TREE_CODE (arg) == MAX_EXPR)
4102 return rationalize_conditional_expr (code, arg);
4104 /* Handle (a = b), (++a), and (--a) used as an "lvalue". */
4105 if (TREE_CODE (arg) == MODIFY_EXPR
4106 || TREE_CODE (arg) == PREINCREMENT_EXPR
4107 || TREE_CODE (arg) == PREDECREMENT_EXPR)
4109 tree lvalue = TREE_OPERAND (arg, 0);
4110 if (TREE_SIDE_EFFECTS (lvalue))
4112 lvalue = stabilize_reference (lvalue);
4113 arg = build (TREE_CODE (arg), TREE_TYPE (arg),
4114 lvalue, TREE_OPERAND (arg, 1));
4116 return unary_complex_lvalue
4117 (code, build (COMPOUND_EXPR, TREE_TYPE (lvalue), arg, lvalue));
4120 if (code != ADDR_EXPR)
4123 /* Handle (a = b) used as an "lvalue" for `&'. */
4124 if (TREE_CODE (arg) == MODIFY_EXPR
4125 || TREE_CODE (arg) == INIT_EXPR)
4127 tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0);
4128 arg = build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result);
4129 TREE_NO_UNUSED_WARNING (arg) = 1;
4133 if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE
4134 || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE
4135 || TREE_CODE (arg) == OFFSET_REF)
4139 my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313);
4141 if (TREE_CODE (arg) != OFFSET_REF)
4144 t = TREE_OPERAND (arg, 1);
4146 /* Check all this code for right semantics. */
4147 if (TREE_CODE (t) == FUNCTION_DECL)
4149 if (DECL_DESTRUCTOR_P (t))
4150 error ("taking address of destructor");
4151 return build_unary_op (ADDR_EXPR, t, 0);
4153 if (TREE_CODE (t) == VAR_DECL)
4154 return build_unary_op (ADDR_EXPR, t, 0);
4159 if (TREE_OPERAND (arg, 0)
4160 && ! is_dummy_object (TREE_OPERAND (arg, 0))
4161 && TREE_CODE (t) != FIELD_DECL)
4163 error ("taking address of bound pointer-to-member expression");
4164 return error_mark_node;
4166 if (!PTRMEM_OK_P (arg))
4167 return build_unary_op (code, arg, 0);
4169 if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE)
4171 error ("cannot create pointer to reference member `%D'", t);
4172 return error_mark_node;
4175 type = build_ptrmem_type (DECL_FIELD_CONTEXT (t), TREE_TYPE (t));
4176 t = make_ptrmem_cst (type, TREE_OPERAND (arg, 1));
4182 /* We permit compiler to make function calls returning
4183 objects of aggregate type look like lvalues. */
4187 if (TREE_CODE (targ) == SAVE_EXPR)
4188 targ = TREE_OPERAND (targ, 0);
4190 if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ)))
4192 if (TREE_CODE (arg) == SAVE_EXPR)
4195 targ = build_cplus_new (TREE_TYPE (arg), arg);
4196 return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ);
4199 if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF)
4200 return build (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)),
4201 TREE_OPERAND (targ, 0), current_function_decl, NULL);
4204 /* Don't let anything else be handled specially. */
4208 /* Mark EXP saying that we need to be able to take the
4209 address of it; it should not be allocated in a register.
4210 Value is true if successful.
4212 C++: we do not allow `current_class_ptr' to be addressable. */
4215 cxx_mark_addressable (tree exp)
4217 register tree x = exp;
4220 switch (TREE_CODE (x))
4227 x = TREE_OPERAND (x, 0);
4231 if (x == current_class_ptr)
4233 error ("cannot take the address of `this', which is an rvalue expression");
4234 TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */
4240 /* Caller should not be trying to mark initialized
4241 constant fields addressable. */
4242 my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0
4243 || DECL_IN_AGGR_P (x) == 0
4245 || DECL_EXTERNAL (x), 314);
4250 if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)
4251 && !DECL_ARTIFICIAL (x) && extra_warnings)
4252 warning ("address requested for `%D', which is declared `register'",
4254 TREE_ADDRESSABLE (x) = 1;
4255 put_var_into_stack (x, /*rescan=*/true);
4259 TREE_ADDRESSABLE (x) = 1;
4260 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1;
4264 TREE_ADDRESSABLE (x) = 1;
4268 TREE_ADDRESSABLE (x) = 1;
4269 cxx_mark_addressable (TREE_OPERAND (x, 0));
4277 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
4280 build_x_conditional_expr (tree ifexp, tree op1, tree op2)
4282 tree orig_ifexp = ifexp;
4283 tree orig_op1 = op1;
4284 tree orig_op2 = op2;
4287 if (processing_template_decl)
4289 /* The standard says that the expression is type-dependent if
4290 IFEXP is type-dependent, even though the eventual type of the
4291 expression doesn't dependent on IFEXP. */
4292 if (type_dependent_expression_p (ifexp)
4293 /* As a GNU extension, the middle operand may be omitted. */
4294 || (op1 && type_dependent_expression_p (op1))
4295 || type_dependent_expression_p (op2))
4296 return build_min_nt (COND_EXPR, ifexp, op1, op2);
4297 ifexp = build_non_dependent_expr (ifexp);
4299 op1 = build_non_dependent_expr (op1);
4300 op2 = build_non_dependent_expr (op2);
4303 expr = build_conditional_expr (ifexp, op1, op2);
4304 if (processing_template_decl && expr != error_mark_node)
4305 return build_min_non_dep (COND_EXPR, expr,
4306 orig_ifexp, orig_op1, orig_op2);
4310 /* Given a list of expressions, return a compound expression
4311 that performs them all and returns the value of the last of them. */
4313 tree build_x_compound_expr_from_list (tree list, const char *msg)
4315 tree expr = TREE_VALUE (list);
4317 if (TREE_CHAIN (list))
4320 pedwarn ("%s expression list treated as compound expression", msg);
4322 for (list = TREE_CHAIN (list); list; list = TREE_CHAIN (list))
4323 expr = build_x_compound_expr (expr, TREE_VALUE (list));
4329 /* Handle overloading of the ',' operator when needed. */
4332 build_x_compound_expr (tree op1, tree op2)
4335 tree orig_op1 = op1;
4336 tree orig_op2 = op2;
4338 if (processing_template_decl)
4340 if (type_dependent_expression_p (op1)
4341 || type_dependent_expression_p (op2))
4342 return build_min_nt (COMPOUND_EXPR, op1, op2);
4343 op1 = build_non_dependent_expr (op1);
4344 op2 = build_non_dependent_expr (op2);
4347 result = build_new_op (COMPOUND_EXPR, LOOKUP_NORMAL, op1, op2, NULL_TREE);
4349 result = build_compound_expr (op1, op2);
4351 if (processing_template_decl && result != error_mark_node)
4352 return build_min_non_dep (COMPOUND_EXPR, result, orig_op1, orig_op2);
4357 /* Build a compound expression. */
4360 build_compound_expr (tree lhs, tree rhs)
4362 lhs = decl_constant_value (lhs);
4363 lhs = convert_to_void (lhs, "left-hand operand of comma");
4365 if (lhs == error_mark_node || rhs == error_mark_node)
4366 return error_mark_node;
4368 if (TREE_CODE (rhs) == TARGET_EXPR)
4370 /* If the rhs is a TARGET_EXPR, then build the compound
4371 expression inside the target_expr's initializer. This
4372 helps the compiler to eliminate unnecessary temporaries. */
4373 tree init = TREE_OPERAND (rhs, 1);
4375 init = build (COMPOUND_EXPR, TREE_TYPE (init), lhs, init);
4376 TREE_OPERAND (rhs, 1) = init;
4381 return build (COMPOUND_EXPR, TREE_TYPE (rhs), lhs, rhs);
4384 /* Issue an error message if casting from SRC_TYPE to DEST_TYPE casts
4385 away constness. DESCRIPTION explains what operation is taking
4389 check_for_casting_away_constness (tree src_type, tree dest_type,
4390 const char *description)
4392 if (casts_away_constness (src_type, dest_type))
4393 error ("%s from type `%T' to type `%T' casts away constness",
4394 description, src_type, dest_type);
4397 /* Return an expression representing static_cast<TYPE>(EXPR). */
4400 build_static_cast (tree type, tree expr)
4405 if (type == error_mark_node || expr == error_mark_node)
4406 return error_mark_node;
4408 if (processing_template_decl)
4410 expr = build_min (STATIC_CAST_EXPR, type, expr);
4411 /* We don't know if it will or will not have side effects. */
4412 TREE_SIDE_EFFECTS (expr) = 1;
4416 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4417 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
4418 if (TREE_CODE (type) != REFERENCE_TYPE
4419 && TREE_CODE (expr) == NOP_EXPR
4420 && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0)))
4421 expr = TREE_OPERAND (expr, 0);
4423 intype = TREE_TYPE (expr);
4425 /* [expr.static.cast]
4427 An lvalue of type "cv1 B", where B is a class type, can be cast
4428 to type "reference to cv2 D", where D is a class derived (clause
4429 _class.derived_) from B, if a valid standard conversion from
4430 "pointer to D" to "pointer to B" exists (_conv.ptr_), cv2 is the
4431 same cv-qualification as, or greater cv-qualification than, cv1,
4432 and B is not a virtual base class of D. */
4433 /* We check this case before checking the validity of "TYPE t =
4434 EXPR;" below because for this case:
4437 struct D : public B { D(const B&); };
4439 void f() { static_cast<const D&>(b); }
4441 we want to avoid constructing a new D. The standard is not
4442 completely clear about this issue, but our interpretation is
4443 consistent with other compilers. */
4444 if (TREE_CODE (type) == REFERENCE_TYPE
4445 && CLASS_TYPE_P (TREE_TYPE (type))
4446 && CLASS_TYPE_P (intype)
4447 && real_lvalue_p (expr)
4448 && DERIVED_FROM_P (intype, TREE_TYPE (type))
4449 && can_convert (build_pointer_type (TYPE_MAIN_VARIANT (intype)),
4450 build_pointer_type (TYPE_MAIN_VARIANT
4451 (TREE_TYPE (type))))
4452 && at_least_as_qualified_p (TREE_TYPE (type), intype))
4454 /* There is a standard conversion from "D*" to "B*" even if "B"
4455 is ambiguous or inaccessible. Therefore, we ask lookup_base
4456 to check these conditions. */
4457 tree base = lookup_base (TREE_TYPE (type), intype, ba_check, NULL);
4459 /* Convert from "B*" to "D*". This function will check that "B"
4460 is not a virtual base of "D". */
4461 expr = build_base_path (MINUS_EXPR, build_address (expr),
4462 base, /*nonnull=*/false);
4463 /* Convert the pointer to a reference -- but then remember that
4464 there are no expressions with reference type in C++. */
4465 return convert_from_reference (build_nop (type, expr));
4468 /* [expr.static.cast]
4470 An expression e can be explicitly converted to a type T using a
4471 static_cast of the form static_cast<T>(e) if the declaration T
4472 t(e);" is well-formed, for some invented temporary variable
4474 result = perform_direct_initialization_if_possible (type, expr);
4476 return convert_from_reference (result);
4478 /* [expr.static.cast]
4480 Any expression can be explicitly converted to type cv void. */
4481 if (TREE_CODE (type) == VOID_TYPE)
4482 return convert_to_void (expr, /*implicit=*/NULL);
4484 /* [expr.static.cast]
4486 The inverse of any standard conversion sequence (clause _conv_),
4487 other than the lvalue-to-rvalue (_conv.lval_), array-to-pointer
4488 (_conv.array_), function-to-pointer (_conv.func_), and boolean
4489 (_conv.bool_) conversions, can be performed explicitly using
4490 static_cast subject to the restriction that the explicit
4491 conversion does not cast away constness (_expr.const.cast_), and
4492 the following additional rules for specific cases: */
4493 /* For reference, the conversions not excluded are: integral
4494 promotions, floating point promotion, integral conversions,
4495 floating point conversions, floating-integral conversions,
4496 pointer conversions, and pointer to member conversions. */
4497 if ((ARITHMETIC_TYPE_P (type) && ARITHMETIC_TYPE_P (intype))
4500 A value of integral _or enumeration_ type can be explicitly
4501 converted to an enumeration type. */
4502 || (INTEGRAL_OR_ENUMERATION_TYPE_P (type)
4503 && INTEGRAL_OR_ENUMERATION_TYPE_P (intype)))
4504 /* Really, build_c_cast should defer to this function rather
4505 than the other way around. */
4506 return build_c_cast (type, expr);
4508 if (TYPE_PTR_P (type) && TYPE_PTR_P (intype)
4509 && CLASS_TYPE_P (TREE_TYPE (type))
4510 && CLASS_TYPE_P (TREE_TYPE (intype))
4511 && can_convert (build_pointer_type (TYPE_MAIN_VARIANT
4512 (TREE_TYPE (intype))),
4513 build_pointer_type (TYPE_MAIN_VARIANT
4514 (TREE_TYPE (type)))))
4518 check_for_casting_away_constness (intype, type, "static_cast");
4519 base = lookup_base (TREE_TYPE (type), TREE_TYPE (intype), ba_check,
4521 return build_base_path (MINUS_EXPR, expr, base, /*nonnull=*/false);
4524 if ((TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype))
4525 || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype)))
4532 c1 = TYPE_PTRMEM_CLASS_TYPE (intype);
4533 c2 = TYPE_PTRMEM_CLASS_TYPE (type);
4535 if (TYPE_PTRMEM_P (type))
4537 t1 = (build_ptrmem_type
4539 TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (intype))));
4540 t2 = (build_ptrmem_type
4542 TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (type))));
4549 if (can_convert (t1, t2))
4551 check_for_casting_away_constness (intype, type, "static_cast");
4552 if (TYPE_PTRMEM_P (type))
4556 if (TREE_CODE (expr) == PTRMEM_CST)
4557 expr = cplus_expand_constant (expr);
4558 delta = get_delta_difference (c1, c2, /*force=*/1);
4559 if (!integer_zerop (delta))
4560 expr = cp_build_binary_op (PLUS_EXPR,
4561 build_nop (ptrdiff_type_node, expr),
4563 return build_nop (type, expr);
4566 return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr,
4571 /* [expr.static.cast]
4573 An rvalue of type "pointer to cv void" can be explicitly
4574 converted to a pointer to object type. A value of type pointer
4575 to object converted to "pointer to cv void" and back to the
4576 original pointer type will have its original value. */
4577 if (TREE_CODE (intype) == POINTER_TYPE
4578 && VOID_TYPE_P (TREE_TYPE (intype))
4579 && TYPE_PTROB_P (type))
4581 check_for_casting_away_constness (intype, type, "static_cast");
4582 return build_nop (type, expr);
4585 error ("invalid static_cast from type `%T' to type `%T'", intype, type);
4586 return error_mark_node;
4590 build_reinterpret_cast (tree type, tree expr)
4594 if (type == error_mark_node || expr == error_mark_node)
4595 return error_mark_node;
4597 if (processing_template_decl)
4599 tree t = build_min (REINTERPRET_CAST_EXPR, type, expr);
4601 if (!TREE_SIDE_EFFECTS (t)
4602 && type_dependent_expression_p (expr))
4603 /* There might turn out to be side effects inside expr. */
4604 TREE_SIDE_EFFECTS (t) = 1;
4608 if (TREE_CODE (type) != REFERENCE_TYPE)
4610 expr = decay_conversion (expr);
4612 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4613 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
4614 if (TREE_CODE (expr) == NOP_EXPR
4615 && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0)))
4616 expr = TREE_OPERAND (expr, 0);
4619 intype = TREE_TYPE (expr);
4621 if (TREE_CODE (type) == REFERENCE_TYPE)
4623 if (! real_lvalue_p (expr))
4625 error ("invalid reinterpret_cast of an rvalue expression of type `%T' to type `%T'", intype, type);
4626 return error_mark_node;
4628 expr = build_unary_op (ADDR_EXPR, expr, 0);
4629 if (expr != error_mark_node)
4630 expr = build_reinterpret_cast
4631 (build_pointer_type (TREE_TYPE (type)), expr);
4632 if (expr != error_mark_node)
4633 expr = build_indirect_ref (expr, 0);
4636 else if (same_type_ignoring_top_level_qualifiers_p (intype, type))
4637 return build_static_cast (type, expr);
4639 if (TYPE_PTR_P (type) && (TREE_CODE (intype) == INTEGER_TYPE
4640 || TREE_CODE (intype) == ENUMERAL_TYPE))
4642 else if (TREE_CODE (type) == INTEGER_TYPE && TYPE_PTR_P (intype))
4644 if (TYPE_PRECISION (type) < TYPE_PRECISION (intype))
4645 pedwarn ("reinterpret_cast from `%T' to `%T' loses precision",
4648 else if ((TYPE_PTRFN_P (type) && TYPE_PTRFN_P (intype))
4649 || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype)))
4651 expr = decl_constant_value (expr);
4652 return fold (build1 (NOP_EXPR, type, expr));
4654 else if ((TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype))
4655 || (TYPE_PTROBV_P (type) && TYPE_PTROBV_P (intype)))
4657 check_for_casting_away_constness (intype, type, "reinterpret_cast");
4658 expr = decl_constant_value (expr);
4659 return fold (build1 (NOP_EXPR, type, expr));
4661 else if ((TYPE_PTRFN_P (type) && TYPE_PTROBV_P (intype))
4662 || (TYPE_PTRFN_P (intype) && TYPE_PTROBV_P (type)))
4664 pedwarn ("ISO C++ forbids casting between pointer-to-function and pointer-to-object");
4665 expr = decl_constant_value (expr);
4666 return fold (build1 (NOP_EXPR, type, expr));
4670 error ("invalid reinterpret_cast from type `%T' to type `%T'",
4672 return error_mark_node;
4675 return cp_convert (type, expr);
4679 build_const_cast (tree type, tree expr)
4683 if (type == error_mark_node || expr == error_mark_node)
4684 return error_mark_node;
4686 if (processing_template_decl)
4688 tree t = build_min (CONST_CAST_EXPR, type, expr);
4690 if (!TREE_SIDE_EFFECTS (t)
4691 && type_dependent_expression_p (expr))
4692 /* There might turn out to be side effects inside expr. */
4693 TREE_SIDE_EFFECTS (t) = 1;
4697 if (!POINTER_TYPE_P (type))
4698 error ("invalid use of const_cast with type `%T', which is not a pointer, reference, nor a pointer-to-data-member type", type);
4699 else if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
4701 error ("invalid use of const_cast with type `%T', which is a pointer or reference to a function type", type);
4702 return error_mark_node;
4705 if (TREE_CODE (type) != REFERENCE_TYPE)
4707 expr = decay_conversion (expr);
4709 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4710 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
4711 if (TREE_CODE (expr) == NOP_EXPR
4712 && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0)))
4713 expr = TREE_OPERAND (expr, 0);
4716 intype = TREE_TYPE (expr);
4718 if (same_type_ignoring_top_level_qualifiers_p (intype, type))
4719 return build_static_cast (type, expr);
4720 else if (TREE_CODE (type) == REFERENCE_TYPE)
4722 if (! real_lvalue_p (expr))
4724 error ("invalid const_cast of an rvalue of type `%T' to type `%T'", intype, type);
4725 return error_mark_node;
4728 if (comp_ptr_ttypes_const (TREE_TYPE (type), intype))
4730 expr = build_unary_op (ADDR_EXPR, expr, 0);
4731 expr = build1 (NOP_EXPR, type, expr);
4732 return convert_from_reference (expr);
4735 else if (((TREE_CODE (type) == POINTER_TYPE
4736 && TREE_CODE (intype) == POINTER_TYPE)
4737 || (TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype)))
4738 && comp_ptr_ttypes_const (TREE_TYPE (type), TREE_TYPE (intype)))
4739 return cp_convert (type, expr);
4741 error ("invalid const_cast from type `%T' to type `%T'", intype, type);
4742 return error_mark_node;
4745 /* Build an expression representing a cast to type TYPE of expression EXPR.
4747 ALLOW_NONCONVERTING is true if we should allow non-converting constructors
4748 when doing the cast. */
4751 build_c_cast (tree type, tree expr)
4753 register tree value = expr;
4756 if (type == error_mark_node || expr == error_mark_node)
4757 return error_mark_node;
4759 if (processing_template_decl)
4761 tree t = build_min (CAST_EXPR, type,
4762 tree_cons (NULL_TREE, value, NULL_TREE));
4763 /* We don't know if it will or will not have side effects. */
4764 TREE_SIDE_EFFECTS (t) = 1;
4768 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
4769 Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */
4770 if (TREE_CODE (type) != REFERENCE_TYPE
4771 && TREE_CODE (value) == NOP_EXPR
4772 && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0)))
4773 value = TREE_OPERAND (value, 0);
4775 if (TREE_CODE (type) == ARRAY_TYPE)
4777 /* Allow casting from T1* to T2[] because Cfront allows it.
4778 NIHCL uses it. It is not valid ISO C++ however. */
4779 if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE)
4781 pedwarn ("ISO C++ forbids casting to an array type `%T'", type);
4782 type = build_pointer_type (TREE_TYPE (type));
4786 error ("ISO C++ forbids casting to an array type `%T'", type);
4787 return error_mark_node;
4791 if (TREE_CODE (type) == FUNCTION_TYPE
4792 || TREE_CODE (type) == METHOD_TYPE)
4794 error ("invalid cast to function type `%T'", type);
4795 return error_mark_node;
4798 if (TREE_CODE (type) == VOID_TYPE)
4800 /* Conversion to void does not cause any of the normal function to
4801 * pointer, array to pointer and lvalue to rvalue decays. */
4803 value = convert_to_void (value, /*implicit=*/NULL);
4807 if (!complete_type_or_else (type, NULL_TREE))
4808 return error_mark_node;
4810 /* Convert functions and arrays to pointers and
4811 convert references to their expanded types,
4812 but don't convert any other types. If, however, we are
4813 casting to a class type, there's no reason to do this: the
4814 cast will only succeed if there is a converting constructor,
4815 and the default conversions will be done at that point. In
4816 fact, doing the default conversion here is actually harmful
4820 struct S { S(const A&); };
4822 since we don't want the array-to-pointer conversion done. */
4823 if (!IS_AGGR_TYPE (type))
4825 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
4826 || (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE
4827 /* Don't do the default conversion on a ->* expression. */
4828 && ! (TREE_CODE (type) == POINTER_TYPE
4829 && bound_pmf_p (value)))
4830 || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
4831 || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE)
4832 value = decay_conversion (value);
4834 else if (TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE)
4835 /* However, even for class types, we still need to strip away
4836 the reference type, since the call to convert_force below
4837 does not expect the input expression to be of reference
4839 value = convert_from_reference (value);
4841 otype = TREE_TYPE (value);
4843 /* Optionally warn about potentially worrisome casts. */
4846 && TREE_CODE (type) == POINTER_TYPE
4847 && TREE_CODE (otype) == POINTER_TYPE
4848 && !at_least_as_qualified_p (TREE_TYPE (type),
4850 warning ("cast from `%T' to `%T' discards qualifiers from pointer target type",
4853 if (TREE_CODE (type) == INTEGER_TYPE
4854 && TYPE_PTR_P (otype)
4855 && TYPE_PRECISION (type) != TYPE_PRECISION (otype))
4856 warning ("cast from pointer to integer of different size");
4858 if (TYPE_PTR_P (type)
4859 && TREE_CODE (otype) == INTEGER_TYPE
4860 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
4861 /* Don't warn about converting any constant. */
4862 && !TREE_CONSTANT (value))
4863 warning ("cast to pointer from integer of different size");
4865 if (TREE_CODE (type) == REFERENCE_TYPE)
4866 value = (convert_from_reference
4867 (convert_to_reference (type, value, CONV_C_CAST,
4868 LOOKUP_COMPLAIN, NULL_TREE)));
4873 value = decl_constant_value (value);
4876 value = convert_force (type, value, CONV_C_CAST);
4878 /* Ignore any integer overflow caused by the cast. */
4879 if (TREE_CODE (value) == INTEGER_CST)
4881 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
4882 TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
4886 /* Warn about possible alignment problems. Do this here when we will have
4887 instantiated any necessary template types. */
4888 if (STRICT_ALIGNMENT && warn_cast_align
4889 && TREE_CODE (type) == POINTER_TYPE
4890 && TREE_CODE (otype) == POINTER_TYPE
4891 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
4892 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
4893 && COMPLETE_TYPE_P (TREE_TYPE (otype))
4894 && COMPLETE_TYPE_P (TREE_TYPE (type))
4895 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
4896 warning ("cast from `%T' to `%T' increases required alignment of target type",
4899 /* Always produce some operator for an explicit cast,
4900 so we can tell (for -pedantic) that the cast is no lvalue. */
4901 if (TREE_CODE (type) != REFERENCE_TYPE && value == expr
4902 && real_lvalue_p (value))
4903 value = non_lvalue (value);
4908 /* Build an assignment expression of lvalue LHS from value RHS.
4909 MODIFYCODE is the code for a binary operator that we use
4910 to combine the old value of LHS with RHS to get the new value.
4911 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment.
4913 C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */
4916 build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs)
4918 register tree result;
4920 tree lhstype = TREE_TYPE (lhs);
4921 tree olhstype = lhstype;
4922 tree olhs = NULL_TREE;
4924 /* Avoid duplicate error messages from operands that had errors. */
4925 if (lhs == error_mark_node || rhs == error_mark_node)
4926 return error_mark_node;
4928 /* Handle control structure constructs used as "lvalues". */
4929 switch (TREE_CODE (lhs))
4931 /* Handle --foo = 5; as these are valid constructs in C++ */
4932 case PREDECREMENT_EXPR:
4933 case PREINCREMENT_EXPR:
4934 if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0)))
4935 lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs),
4936 stabilize_reference (TREE_OPERAND (lhs, 0)),
4937 TREE_OPERAND (lhs, 1));
4938 return build (COMPOUND_EXPR, lhstype,
4940 build_modify_expr (TREE_OPERAND (lhs, 0),
4943 /* Handle (a, b) used as an "lvalue". */
4945 newrhs = build_modify_expr (TREE_OPERAND (lhs, 1),
4947 if (newrhs == error_mark_node)
4948 return error_mark_node;
4949 return build (COMPOUND_EXPR, lhstype,
4950 TREE_OPERAND (lhs, 0), newrhs);
4953 if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0)))
4954 lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs),
4955 stabilize_reference (TREE_OPERAND (lhs, 0)),
4956 TREE_OPERAND (lhs, 1));
4957 newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs);
4958 if (newrhs == error_mark_node)
4959 return error_mark_node;
4960 return build (COMPOUND_EXPR, lhstype, lhs, newrhs);
4962 /* Handle (a ? b : c) used as an "lvalue". */
4965 /* Produce (a ? (b = rhs) : (c = rhs))
4966 except that the RHS goes through a save-expr
4967 so the code to compute it is only emitted once. */
4969 tree preeval = NULL_TREE;
4971 rhs = stabilize_expr (rhs, &preeval);
4973 /* Check this here to avoid odd errors when trying to convert
4974 a throw to the type of the COND_EXPR. */
4975 if (!lvalue_or_else (lhs, "assignment"))
4976 return error_mark_node;
4978 cond = build_conditional_expr
4979 (TREE_OPERAND (lhs, 0),
4980 build_modify_expr (cp_convert (TREE_TYPE (lhs),
4981 TREE_OPERAND (lhs, 1)),
4983 build_modify_expr (cp_convert (TREE_TYPE (lhs),
4984 TREE_OPERAND (lhs, 2)),
4987 if (cond == error_mark_node)
4989 /* Make sure the code to compute the rhs comes out
4990 before the split. */
4991 return build (COMPOUND_EXPR, TREE_TYPE (lhs), preeval, cond);
4998 if (modifycode == INIT_EXPR)
5000 if (TREE_CODE (rhs) == CONSTRUCTOR)
5002 if (! same_type_p (TREE_TYPE (rhs), lhstype))
5003 /* Call convert to generate an error; see PR 11063. */
5004 rhs = convert (lhstype, rhs);
5005 result = build (INIT_EXPR, lhstype, lhs, rhs);
5006 TREE_SIDE_EFFECTS (result) = 1;
5009 else if (! IS_AGGR_TYPE (lhstype))
5010 /* Do the default thing */;
5013 result = build_special_member_call (lhs, complete_ctor_identifier,
5014 build_tree_list (NULL_TREE, rhs),
5015 TYPE_BINFO (lhstype),
5017 if (result == NULL_TREE)
5018 return error_mark_node;
5024 if (TREE_CODE (lhstype) == REFERENCE_TYPE)
5026 lhs = convert_from_reference (lhs);
5027 olhstype = lhstype = TREE_TYPE (lhs);
5029 lhs = require_complete_type (lhs);
5030 if (lhs == error_mark_node)
5031 return error_mark_node;
5033 if (modifycode == NOP_EXPR)
5035 /* `operator=' is not an inheritable operator. */
5036 if (! IS_AGGR_TYPE (lhstype))
5037 /* Do the default thing */;
5040 result = build_new_op (MODIFY_EXPR, LOOKUP_NORMAL,
5041 lhs, rhs, make_node (NOP_EXPR));
5042 if (result == NULL_TREE)
5043 return error_mark_node;
5050 /* A binary op has been requested. Combine the old LHS
5051 value with the RHS producing the value we should actually
5052 store into the LHS. */
5054 my_friendly_assert (!PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE),
5056 lhs = stabilize_reference (lhs);
5057 newrhs = cp_build_binary_op (modifycode, lhs, rhs);
5058 if (newrhs == error_mark_node)
5060 error (" in evaluation of `%Q(%#T, %#T)'", modifycode,
5061 TREE_TYPE (lhs), TREE_TYPE (rhs));
5062 return error_mark_node;
5065 /* Now it looks like a plain assignment. */
5066 modifycode = NOP_EXPR;
5068 my_friendly_assert (TREE_CODE (lhstype) != REFERENCE_TYPE, 20011220);
5069 my_friendly_assert (TREE_CODE (TREE_TYPE (newrhs)) != REFERENCE_TYPE,
5073 /* Handle a cast used as an "lvalue".
5074 We have already performed any binary operator using the value as cast.
5075 Now convert the result to the cast type of the lhs,
5076 and then true type of the lhs and store it there;
5077 then convert result back to the cast type to be the value
5078 of the assignment. */
5080 switch (TREE_CODE (lhs))
5085 case FIX_TRUNC_EXPR:
5086 case FIX_FLOOR_EXPR:
5087 case FIX_ROUND_EXPR:
5090 tree inner_lhs = TREE_OPERAND (lhs, 0);
5093 if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE
5094 || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE
5095 || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE
5096 || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE)
5097 newrhs = decay_conversion (newrhs);
5099 /* ISO C++ 5.4/1: The result is an lvalue if T is a reference
5100 type, otherwise the result is an rvalue. */
5101 if (! lvalue_p (lhs))
5102 pedwarn ("ISO C++ forbids cast to non-reference type used as lvalue");
5104 result = build_modify_expr (inner_lhs, NOP_EXPR,
5105 cp_convert (TREE_TYPE (inner_lhs),
5106 cp_convert (lhstype, newrhs)));
5107 if (result == error_mark_node)
5109 return cp_convert (TREE_TYPE (lhs), result);
5116 /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
5117 Reject anything strange now. */
5119 if (!lvalue_or_else (lhs, "assignment"))
5120 return error_mark_node;
5122 /* Warn about modifying something that is `const'. Don't warn if
5123 this is initialization. */
5124 if (modifycode != INIT_EXPR
5125 && (TREE_READONLY (lhs) || CP_TYPE_CONST_P (lhstype)
5126 /* Functions are not modifiable, even though they are
5128 || TREE_CODE (TREE_TYPE (lhs)) == FUNCTION_TYPE
5129 || TREE_CODE (TREE_TYPE (lhs)) == METHOD_TYPE
5130 /* If it's an aggregate and any field is const, then it is
5131 effectively const. */
5132 || (CLASS_TYPE_P (lhstype)
5133 && C_TYPE_FIELDS_READONLY (lhstype))))
5134 readonly_error (lhs, "assignment", 0);
5136 /* If storing into a structure or union member, it has probably been
5137 given type `int'. Compute the type that would go with the actual
5138 amount of storage the member occupies. */
5140 if (TREE_CODE (lhs) == COMPONENT_REF
5141 && (TREE_CODE (lhstype) == INTEGER_TYPE
5142 || TREE_CODE (lhstype) == REAL_TYPE
5143 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
5145 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
5147 /* If storing in a field that is in actuality a short or narrower
5148 than one, we must store in the field in its actual type. */
5150 if (lhstype != TREE_TYPE (lhs))
5152 /* Avoid warnings converting integral types back into enums for
5154 if (TREE_CODE (lhstype) == INTEGER_TYPE
5155 && TREE_CODE (olhstype) == ENUMERAL_TYPE)
5157 if (TREE_SIDE_EFFECTS (lhs))
5158 lhs = stabilize_reference (lhs);
5161 lhs = copy_node (lhs);
5162 TREE_TYPE (lhs) = lhstype;
5166 /* Convert new value to destination type. */
5168 if (TREE_CODE (lhstype) == ARRAY_TYPE)
5172 if (!same_or_base_type_p (TYPE_MAIN_VARIANT (lhstype),
5173 TYPE_MAIN_VARIANT (TREE_TYPE (rhs))))
5175 error ("incompatible types in assignment of `%T' to `%T'",
5176 TREE_TYPE (rhs), lhstype);
5177 return error_mark_node;
5180 /* Allow array assignment in compiler-generated code. */
5181 if (! DECL_ARTIFICIAL (current_function_decl))
5182 pedwarn ("ISO C++ forbids assignment of arrays");
5184 from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE
5185 ? 1 + (modifycode != INIT_EXPR): 0;
5186 return build_vec_init (lhs, NULL_TREE, newrhs, from_array);
5189 if (modifycode == INIT_EXPR)
5190 newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL,
5191 "initialization", NULL_TREE, 0);
5194 /* Avoid warnings on enum bit fields. */
5195 if (TREE_CODE (olhstype) == ENUMERAL_TYPE
5196 && TREE_CODE (lhstype) == INTEGER_TYPE)
5198 newrhs = convert_for_assignment (olhstype, newrhs, "assignment",
5200 newrhs = convert_force (lhstype, newrhs, 0);
5203 newrhs = convert_for_assignment (lhstype, newrhs, "assignment",
5205 if (TREE_CODE (newrhs) == CALL_EXPR
5206 && TYPE_NEEDS_CONSTRUCTING (lhstype))
5207 newrhs = build_cplus_new (lhstype, newrhs);
5209 /* Can't initialize directly from a TARGET_EXPR, since that would
5210 cause the lhs to be constructed twice, and possibly result in
5211 accidental self-initialization. So we force the TARGET_EXPR to be
5212 expanded without a target. */
5213 if (TREE_CODE (newrhs) == TARGET_EXPR)
5214 newrhs = build (COMPOUND_EXPR, TREE_TYPE (newrhs), newrhs,
5215 TREE_OPERAND (newrhs, 0));
5218 if (newrhs == error_mark_node)
5219 return error_mark_node;
5221 result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR,
5222 lhstype, lhs, newrhs);
5224 TREE_SIDE_EFFECTS (result) = 1;
5226 /* If we got the LHS in a different type for storing in,
5227 convert the result back to the nominal type of LHS
5228 so that the value we return always has the same type
5229 as the LHS argument. */
5231 if (olhstype == TREE_TYPE (result))
5235 result = build (COMPOUND_EXPR, olhstype, result, olhs);
5236 TREE_NO_UNUSED_WARNING (result) = 1;
5239 return convert_for_assignment (olhstype, result, "assignment",
5244 build_x_modify_expr (tree lhs, enum tree_code modifycode, tree rhs)
5246 if (processing_template_decl)
5247 return build_min_nt (MODOP_EXPR, lhs,
5248 build_min_nt (modifycode, NULL_TREE, NULL_TREE), rhs);
5250 if (modifycode != NOP_EXPR)
5252 tree rval = build_new_op (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs,
5253 make_node (modifycode));
5257 return build_modify_expr (lhs, modifycode, rhs);
5261 /* Get difference in deltas for different pointer to member function
5262 types. Returns an integer constant of type PTRDIFF_TYPE_NODE. If
5263 the conversion is invalid, the constant is zero. If FORCE is true,
5264 then allow reverse conversions as well.
5266 Note that the naming of FROM and TO is kind of backwards; the return
5267 value is what we add to a TO in order to get a FROM. They are named
5268 this way because we call this function to find out how to convert from
5269 a pointer to member of FROM to a pointer to member of TO. */
5272 get_delta_difference (tree from, tree to, int force)
5278 binfo = lookup_base (to, from, ba_check, &kind);
5279 if (kind == bk_inaccessible || kind == bk_ambig)
5281 error (" in pointer to member function conversion");
5288 error_not_base_type (from, to);
5289 error (" in pointer to member conversion");
5292 binfo = lookup_base (from, to, ba_check, &kind);
5295 virt_binfo = binfo_from_vbase (binfo);
5298 /* This is a reinterpret cast, we choose to do nothing. */
5299 warning ("pointer to member cast via virtual base `%T'",
5300 BINFO_TYPE (virt_binfo));
5303 return convert_to_integer (ptrdiff_type_node,
5304 size_diffop (size_zero_node,
5305 BINFO_OFFSET (binfo)));
5308 virt_binfo = binfo_from_vbase (binfo);
5310 return convert_to_integer (ptrdiff_type_node, BINFO_OFFSET (binfo));
5312 /* This is a reinterpret cast, we choose to do nothing. */
5314 warning ("pointer to member cast via virtual base `%T'",
5315 BINFO_TYPE (virt_binfo));
5317 error ("pointer to member conversion via virtual base `%T'",
5318 BINFO_TYPE (virt_binfo));
5321 return convert_to_integer(ptrdiff_type_node, integer_zero_node);
5324 /* Return a constructor for the pointer-to-member-function TYPE using
5325 the other components as specified. */
5328 build_ptrmemfunc1 (tree type, tree delta, tree pfn)
5334 /* Pull the FIELD_DECLs out of the type. */
5335 pfn_field = TYPE_FIELDS (type);
5336 delta_field = TREE_CHAIN (pfn_field);
5338 /* Make sure DELTA has the type we want. */
5339 delta = convert_and_check (delta_type_node, delta);
5341 /* Finish creating the initializer. */
5342 u = tree_cons (pfn_field, pfn,
5343 build_tree_list (delta_field, delta));
5344 u = build_constructor (type, u);
5345 TREE_CONSTANT (u) = TREE_CONSTANT (pfn) && TREE_CONSTANT (delta);
5346 TREE_STATIC (u) = (TREE_CONSTANT (u)
5347 && (initializer_constant_valid_p (pfn, TREE_TYPE (pfn))
5349 && (initializer_constant_valid_p (delta, TREE_TYPE (delta))
5354 /* Build a constructor for a pointer to member function. It can be
5355 used to initialize global variables, local variable, or used
5356 as a value in expressions. TYPE is the POINTER to METHOD_TYPE we
5359 If FORCE is nonzero, then force this conversion, even if
5360 we would rather not do it. Usually set when using an explicit
5363 Return error_mark_node, if something goes wrong. */
5366 build_ptrmemfunc (tree type, tree pfn, int force)
5372 if (error_operand_p (pfn))
5373 return error_mark_node;
5375 pfn_type = TREE_TYPE (pfn);
5376 to_type = build_ptrmemfunc_type (type);
5378 /* Handle multiple conversions of pointer to member functions. */
5379 if (TYPE_PTRMEMFUNC_P (pfn_type))
5381 tree delta = NULL_TREE;
5382 tree npfn = NULL_TREE;
5386 && !can_convert_arg (to_type, TREE_TYPE (pfn), pfn))
5387 error ("invalid conversion to type `%T' from type `%T'",
5390 n = get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type),
5391 TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type),
5394 /* We don't have to do any conversion to convert a
5395 pointer-to-member to its own type. But, we don't want to
5396 just return a PTRMEM_CST if there's an explicit cast; that
5397 cast should make the expression an invalid template argument. */
5398 if (TREE_CODE (pfn) != PTRMEM_CST)
5400 if (same_type_p (to_type, pfn_type))
5402 else if (integer_zerop (n))
5403 return build_reinterpret_cast (to_type, pfn);
5406 if (TREE_SIDE_EFFECTS (pfn))
5407 pfn = save_expr (pfn);
5409 /* Obtain the function pointer and the current DELTA. */
5410 if (TREE_CODE (pfn) == PTRMEM_CST)
5411 expand_ptrmemfunc_cst (pfn, &delta, &npfn);
5414 npfn = build_ptrmemfunc_access_expr (pfn, pfn_identifier);
5415 delta = build_ptrmemfunc_access_expr (pfn, delta_identifier);
5418 /* Just adjust the DELTA field. */
5419 my_friendly_assert (TREE_TYPE (delta) == ptrdiff_type_node, 20030727);
5420 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta)
5421 n = cp_build_binary_op (LSHIFT_EXPR, n, integer_one_node);
5422 delta = cp_build_binary_op (PLUS_EXPR, delta, n);
5423 return build_ptrmemfunc1 (to_type, delta, npfn);
5426 /* Handle null pointer to member function conversions. */
5427 if (integer_zerop (pfn))
5429 pfn = build_c_cast (type, integer_zero_node);
5430 return build_ptrmemfunc1 (to_type,
5435 if (type_unknown_p (pfn))
5436 return instantiate_type (type, pfn, tf_error | tf_warning);
5438 fn = TREE_OPERAND (pfn, 0);
5439 my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 0);
5440 return make_ptrmem_cst (to_type, fn);
5443 /* Return the DELTA, IDX, PFN, and DELTA2 values for the PTRMEM_CST
5446 ??? There is no consistency as to the types returned for the above
5447 values. Some code acts as if its a sizetype and some as if its
5448 integer_type_node. */
5451 expand_ptrmemfunc_cst (tree cst, tree *delta, tree *pfn)
5453 tree type = TREE_TYPE (cst);
5454 tree fn = PTRMEM_CST_MEMBER (cst);
5455 tree ptr_class, fn_class;
5457 my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 0);
5459 /* The class that the function belongs to. */
5460 fn_class = DECL_CONTEXT (fn);
5462 /* The class that we're creating a pointer to member of. */
5463 ptr_class = TYPE_PTRMEMFUNC_OBJECT_TYPE (type);
5465 /* First, calculate the adjustment to the function's class. */
5466 *delta = get_delta_difference (fn_class, ptr_class, /*force=*/0);
5468 if (!DECL_VIRTUAL_P (fn))
5469 *pfn = convert (TYPE_PTRMEMFUNC_FN_TYPE (type), build_addr_func (fn));
5472 /* If we're dealing with a virtual function, we have to adjust 'this'
5473 again, to point to the base which provides the vtable entry for
5474 fn; the call will do the opposite adjustment. */
5475 tree orig_class = DECL_CONTEXT (fn);
5476 tree binfo = binfo_or_else (orig_class, fn_class);
5477 *delta = fold (build (PLUS_EXPR, TREE_TYPE (*delta),
5478 *delta, BINFO_OFFSET (binfo)));
5480 /* We set PFN to the vtable offset at which the function can be
5481 found, plus one (unless ptrmemfunc_vbit_in_delta, in which
5482 case delta is shifted left, and then incremented). */
5483 *pfn = DECL_VINDEX (fn);
5484 *pfn = fold (build (MULT_EXPR, integer_type_node, *pfn,
5485 TYPE_SIZE_UNIT (vtable_entry_type)));
5487 switch (TARGET_PTRMEMFUNC_VBIT_LOCATION)
5489 case ptrmemfunc_vbit_in_pfn:
5490 *pfn = fold (build (PLUS_EXPR, integer_type_node, *pfn,
5494 case ptrmemfunc_vbit_in_delta:
5495 *delta = fold (build (LSHIFT_EXPR, TREE_TYPE (*delta),
5496 *delta, integer_one_node));
5497 *delta = fold (build (PLUS_EXPR, TREE_TYPE (*delta),
5498 *delta, integer_one_node));
5505 *pfn = fold (build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type),
5510 /* Return an expression for PFN from the pointer-to-member function
5514 pfn_from_ptrmemfunc (tree t)
5516 if (TREE_CODE (t) == PTRMEM_CST)
5521 expand_ptrmemfunc_cst (t, &delta, &pfn);
5526 return build_ptrmemfunc_access_expr (t, pfn_identifier);
5529 /* Expression EXPR is about to be implicitly converted to TYPE. Warn
5530 if this is a potentially dangerous thing to do. Returns a possibly
5534 dubious_conversion_warnings (tree type, tree expr,
5535 const char *errtype, tree fndecl, int parmnum)
5537 type = non_reference (type);
5539 /* Issue warnings about peculiar, but valid, uses of NULL. */
5540 if (ARITHMETIC_TYPE_P (type) && expr == null_node)
5543 warning ("passing NULL used for non-pointer %s %P of `%D'",
5544 errtype, parmnum, fndecl);
5546 warning ("%s to non-pointer type `%T' from NULL", errtype, type);
5549 /* Warn about assigning a floating-point type to an integer type. */
5550 if (TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE
5551 && TREE_CODE (type) == INTEGER_TYPE)
5554 warning ("passing `%T' for %s %P of `%D'",
5555 TREE_TYPE (expr), errtype, parmnum, fndecl);
5557 warning ("%s to `%T' from `%T'", errtype, type, TREE_TYPE (expr));
5559 /* And warn about assigning a negative value to an unsigned
5561 else if (TREE_UNSIGNED (type) && TREE_CODE (type) != BOOLEAN_TYPE)
5563 if (TREE_CODE (expr) == INTEGER_CST
5564 && TREE_NEGATED_INT (expr))
5567 warning ("passing negative value `%E' for %s %P of `%D'",
5568 expr, errtype, parmnum, fndecl);
5570 warning ("%s of negative value `%E' to `%T'",
5571 errtype, expr, type);
5574 overflow_warning (expr);
5576 if (TREE_CONSTANT (expr))
5582 /* Convert value RHS to type TYPE as preparation for an assignment to
5583 an lvalue of type TYPE. ERRTYPE is a string to use in error
5584 messages: "assignment", "return", etc. If FNDECL is non-NULL, we
5585 are doing the conversion in order to pass the PARMNUMth argument of
5589 convert_for_assignment (tree type, tree rhs,
5590 const char *errtype, tree fndecl, int parmnum)
5592 register tree rhstype;
5593 register enum tree_code coder;
5595 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
5596 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
5597 rhs = TREE_OPERAND (rhs, 0);
5599 rhstype = TREE_TYPE (rhs);
5600 coder = TREE_CODE (rhstype);
5602 if (TREE_CODE (type) == VECTOR_TYPE && coder == VECTOR_TYPE
5603 && ((*targetm.vector_opaque_p) (type)
5604 || (*targetm.vector_opaque_p) (rhstype)))
5605 return convert (type, rhs);
5607 if (rhs == error_mark_node || rhstype == error_mark_node)
5608 return error_mark_node;
5609 if (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)
5610 return error_mark_node;
5612 rhs = dubious_conversion_warnings (type, rhs, errtype, fndecl, parmnum);
5614 /* The RHS of an assignment cannot have void type. */
5615 if (coder == VOID_TYPE)
5617 error ("void value not ignored as it ought to be");
5618 return error_mark_node;
5621 /* Simplify the RHS if possible. */
5622 if (TREE_CODE (rhs) == CONST_DECL)
5623 rhs = DECL_INITIAL (rhs);
5625 /* We do not use decl_constant_value here because of this case:
5627 const char* const s = "s";
5629 The conversion rules for a string literal are more lax than for a
5630 variable; in particular, a string literal can be converted to a
5631 "char *" but the variable "s" cannot be converted in the same
5632 way. If the conversion is allowed, the optimization should be
5633 performed while creating the converted expression. */
5637 The expression is implicitly converted (clause _conv_) to the
5638 cv-unqualified type of the left operand.
5640 We allow bad conversions here because by the time we get to this point
5641 we are committed to doing the conversion. If we end up doing a bad
5642 conversion, convert_like will complain. */
5643 if (!can_convert_arg_bad (type, rhstype, rhs))
5645 /* When -Wno-pmf-conversions is use, we just silently allow
5646 conversions from pointers-to-members to plain pointers. If
5647 the conversion doesn't work, cp_convert will complain. */
5649 && TYPE_PTR_P (type)
5650 && TYPE_PTRMEMFUNC_P (rhstype))
5651 rhs = cp_convert (strip_top_quals (type), rhs);
5654 /* If the right-hand side has unknown type, then it is an
5655 overloaded function. Call instantiate_type to get error
5657 if (rhstype == unknown_type_node)
5658 instantiate_type (type, rhs, tf_error | tf_warning);
5660 error ("cannot convert `%T' to `%T' for argument `%P' to `%D'",
5661 rhstype, type, parmnum, fndecl);
5663 error ("cannot convert `%T' to `%T' in %s", rhstype, type,
5665 return error_mark_node;
5668 return perform_implicit_conversion (strip_top_quals (type), rhs);
5671 /* Convert RHS to be of type TYPE.
5672 If EXP is nonzero, it is the target of the initialization.
5673 ERRTYPE is a string to use in error messages.
5675 Two major differences between the behavior of
5676 `convert_for_assignment' and `convert_for_initialization'
5677 are that references are bashed in the former, while
5678 copied in the latter, and aggregates are assigned in
5679 the former (operator=) while initialized in the
5682 If using constructor make sure no conversion operator exists, if one does
5683 exist, an ambiguity exists.
5685 If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */
5688 convert_for_initialization (tree exp, tree type, tree rhs, int flags,
5689 const char *errtype, tree fndecl, int parmnum)
5691 register enum tree_code codel = TREE_CODE (type);
5692 register tree rhstype;
5693 register enum tree_code coder;
5695 /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
5696 Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */
5697 if (TREE_CODE (rhs) == NOP_EXPR
5698 && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0))
5699 && codel != REFERENCE_TYPE)
5700 rhs = TREE_OPERAND (rhs, 0);
5702 if (rhs == error_mark_node
5703 || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node))
5704 return error_mark_node;
5706 if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE)
5707 rhs = convert_from_reference (rhs);
5709 if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
5710 && TREE_CODE (type) != ARRAY_TYPE
5711 && (TREE_CODE (type) != REFERENCE_TYPE
5712 || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE))
5713 || (TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE
5714 && (TREE_CODE (type) != REFERENCE_TYPE
5715 || TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE))
5716 || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE)
5717 rhs = decay_conversion (rhs);
5719 rhstype = TREE_TYPE (rhs);
5720 coder = TREE_CODE (rhstype);
5722 if (coder == ERROR_MARK)
5723 return error_mark_node;
5725 /* We accept references to incomplete types, so we can
5726 return here before checking if RHS is of complete type. */
5728 if (codel == REFERENCE_TYPE)
5730 /* This should eventually happen in convert_arguments. */
5731 int savew = 0, savee = 0;
5734 savew = warningcount, savee = errorcount;
5735 rhs = initialize_reference (type, rhs, /*decl=*/NULL_TREE,
5739 if (warningcount > savew)
5740 cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl);
5741 else if (errorcount > savee)
5742 cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl);
5748 exp = require_complete_type (exp);
5749 if (exp == error_mark_node)
5750 return error_mark_node;
5752 rhstype = non_reference (rhstype);
5754 type = complete_type (type);
5756 if (IS_AGGR_TYPE (type))
5757 return ocp_convert (type, rhs, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);
5759 return convert_for_assignment (type, rhs, errtype, fndecl, parmnum);
5762 /* Expand an ASM statement with operands, handling output operands
5763 that are not variables or INDIRECT_REFS by transforming such
5764 cases into cases that expand_asm_operands can handle.
5766 Arguments are same as for expand_asm_operands.
5768 We don't do default conversions on all inputs, because it can screw
5769 up operands that are expected to be in memory. */
5772 c_expand_asm_operands (tree string, tree outputs, tree inputs, tree clobbers,
5773 int vol, location_t locus)
5775 int noutputs = list_length (outputs);
5777 /* o[I] is the place that output number I should be written. */
5778 register tree *o = alloca (noutputs * sizeof (tree));
5781 /* Record the contents of OUTPUTS before it is modified. */
5782 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
5783 o[i] = TREE_VALUE (tail);
5785 /* Generate the ASM_OPERANDS insn;
5786 store into the TREE_VALUEs of OUTPUTS some trees for
5787 where the values were actually stored. */
5788 expand_asm_operands (string, outputs, inputs, clobbers, vol, locus);
5790 /* Copy all the intermediate outputs into the specified outputs. */
5791 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
5793 if (o[i] != TREE_VALUE (tail))
5795 expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
5796 const0_rtx, VOIDmode, EXPAND_NORMAL);
5799 /* Restore the original value so that it's correct the next
5800 time we expand this function. */
5801 TREE_VALUE (tail) = o[i];
5803 /* Detect modification of read-only values.
5804 (Otherwise done by build_modify_expr.) */
5807 tree type = TREE_TYPE (o[i]);
5808 if (type != error_mark_node
5809 && (CP_TYPE_CONST_P (type)
5810 || (CLASS_TYPE_P (type) && C_TYPE_FIELDS_READONLY (type))))
5811 readonly_error (o[i], "modification by `asm'", 1);
5815 /* Those MODIFY_EXPRs could do autoincrements. */
5819 /* If RETVAL is the address of, or a reference to, a local variable or
5820 temporary give an appropriate warning. */
5823 maybe_warn_about_returning_address_of_local (tree retval)
5825 tree valtype = TREE_TYPE (DECL_RESULT (current_function_decl));
5826 tree whats_returned = retval;
5830 if (TREE_CODE (whats_returned) == COMPOUND_EXPR)
5831 whats_returned = TREE_OPERAND (whats_returned, 1);
5832 else if (TREE_CODE (whats_returned) == CONVERT_EXPR
5833 || TREE_CODE (whats_returned) == NON_LVALUE_EXPR
5834 || TREE_CODE (whats_returned) == NOP_EXPR)
5835 whats_returned = TREE_OPERAND (whats_returned, 0);
5840 if (TREE_CODE (whats_returned) != ADDR_EXPR)
5842 whats_returned = TREE_OPERAND (whats_returned, 0);
5844 if (TREE_CODE (valtype) == REFERENCE_TYPE)
5846 if (TREE_CODE (whats_returned) == AGGR_INIT_EXPR
5847 || TREE_CODE (whats_returned) == TARGET_EXPR)
5849 warning ("returning reference to temporary");
5852 if (TREE_CODE (whats_returned) == VAR_DECL
5853 && DECL_NAME (whats_returned)
5854 && TEMP_NAME_P (DECL_NAME (whats_returned)))
5856 warning ("reference to non-lvalue returned");
5861 if (TREE_CODE (whats_returned) == VAR_DECL
5862 && DECL_NAME (whats_returned)
5863 && DECL_FUNCTION_SCOPE_P (whats_returned)
5864 && !(TREE_STATIC (whats_returned)
5865 || TREE_PUBLIC (whats_returned)))
5867 if (TREE_CODE (valtype) == REFERENCE_TYPE)
5868 cp_warning_at ("reference to local variable `%D' returned",
5871 cp_warning_at ("address of local variable `%D' returned",
5877 /* Check that returning RETVAL from the current function is valid.
5878 Return an expression explicitly showing all conversions required to
5879 change RETVAL into the function return type, and to assign it to
5880 the DECL_RESULT for the function. */
5883 check_return_expr (tree retval)
5886 /* The type actually returned by the function, after any
5889 int fn_returns_value_p;
5891 /* A `volatile' function is one that isn't supposed to return, ever.
5892 (This is a G++ extension, used to get better code for functions
5893 that call the `volatile' function.) */
5894 if (TREE_THIS_VOLATILE (current_function_decl))
5895 warning ("function declared `noreturn' has a `return' statement");
5897 /* Check for various simple errors. */
5898 if (DECL_DESTRUCTOR_P (current_function_decl))
5901 error ("returning a value from a destructor");
5904 else if (DECL_CONSTRUCTOR_P (current_function_decl))
5906 if (in_function_try_handler)
5907 /* If a return statement appears in a handler of the
5908 function-try-block of a constructor, the program is ill-formed. */
5909 error ("cannot return from a handler of a function-try-block of a constructor");
5911 /* You can't return a value from a constructor. */
5912 error ("returning a value from a constructor");
5916 if (processing_template_decl)
5918 current_function_returns_value = 1;
5922 /* When no explicit return-value is given in a function with a named
5923 return value, the named return value is used. */
5924 result = DECL_RESULT (current_function_decl);
5925 valtype = TREE_TYPE (result);
5926 my_friendly_assert (valtype != NULL_TREE, 19990924);
5927 fn_returns_value_p = !VOID_TYPE_P (valtype);
5928 if (!retval && DECL_NAME (result) && fn_returns_value_p)
5931 /* Check for a return statement with no return value in a function
5932 that's supposed to return a value. */
5933 if (!retval && fn_returns_value_p)
5935 pedwarn ("return-statement with no value, in function returning '%T'",
5937 /* Clear this, so finish_function won't say that we reach the
5938 end of a non-void function (which we don't, we gave a
5940 current_function_returns_null = 0;
5942 /* Check for a return statement with a value in a function that
5943 isn't supposed to return a value. */
5944 else if (retval && !fn_returns_value_p)
5946 if (VOID_TYPE_P (TREE_TYPE (retval)))
5947 /* You can return a `void' value from a function of `void'
5948 type. In that case, we have to evaluate the expression for
5949 its side-effects. */
5950 finish_expr_stmt (retval);
5952 pedwarn ("return-statement with a value, in function "
5953 "returning 'void'");
5955 current_function_returns_null = 1;
5957 /* There's really no value to return, after all. */
5961 /* Remember that this function can sometimes return without a
5963 current_function_returns_null = 1;
5965 /* Remember that this function did return a value. */
5966 current_function_returns_value = 1;
5968 /* Only operator new(...) throw(), can return NULL [expr.new/13]. */
5969 if ((DECL_OVERLOADED_OPERATOR_P (current_function_decl) == NEW_EXPR
5970 || DECL_OVERLOADED_OPERATOR_P (current_function_decl) == VEC_NEW_EXPR)
5971 && !TYPE_NOTHROW_P (TREE_TYPE (current_function_decl))
5973 && null_ptr_cst_p (retval))
5974 warning ("`operator new' must not return NULL unless it is declared `throw()' (or -fcheck-new is in effect)");
5976 /* Effective C++ rule 15. See also start_function. */
5978 && DECL_NAME (current_function_decl) == ansi_assopname(NOP_EXPR)
5979 && retval != current_class_ref)
5980 warning ("`operator=' should return a reference to `*this'");
5982 /* The fabled Named Return Value optimization, as per [class.copy]/15:
5984 [...] For a function with a class return type, if the expression
5985 in the return statement is the name of a local object, and the cv-
5986 unqualified type of the local object is the same as the function
5987 return type, an implementation is permitted to omit creating the tem-
5988 porary object to hold the function return value [...]
5990 So, if this is a value-returning function that always returns the same
5991 local variable, remember it.
5993 It might be nice to be more flexible, and choose the first suitable
5994 variable even if the function sometimes returns something else, but
5995 then we run the risk of clobbering the variable we chose if the other
5996 returned expression uses the chosen variable somehow. And people expect
5997 this restriction, anyway. (jason 2000-11-19)
5999 See finish_function, cxx_expand_function_start, and
6000 cp_copy_res_decl_for_inlining for other pieces of this
6003 if (fn_returns_value_p && flag_elide_constructors)
6005 if (retval != NULL_TREE
6006 && (current_function_return_value == NULL_TREE
6007 || current_function_return_value == retval)
6008 && TREE_CODE (retval) == VAR_DECL
6009 && DECL_CONTEXT (retval) == current_function_decl
6010 && ! TREE_STATIC (retval)
6011 && (DECL_ALIGN (retval)
6012 >= DECL_ALIGN (DECL_RESULT (current_function_decl)))
6013 && same_type_p ((TYPE_MAIN_VARIANT
6014 (TREE_TYPE (retval))),
6016 (TREE_TYPE (TREE_TYPE (current_function_decl))))))
6017 current_function_return_value = retval;
6019 current_function_return_value = error_mark_node;
6022 /* We don't need to do any conversions when there's nothing being
6024 if (!retval || retval == error_mark_node)
6027 /* Do any required conversions. */
6028 if (retval == result || DECL_CONSTRUCTOR_P (current_function_decl))
6029 /* No conversions are required. */
6033 /* The type the function is declared to return. */
6034 tree functype = TREE_TYPE (TREE_TYPE (current_function_decl));
6036 /* First convert the value to the function's return type, then
6037 to the type of return value's location to handle the
6038 case that functype is smaller than the valtype. */
6039 retval = convert_for_initialization
6040 (NULL_TREE, functype, retval, LOOKUP_NORMAL|LOOKUP_ONLYCONVERTING,
6041 "return", NULL_TREE, 0);
6042 retval = convert (valtype, retval);
6044 /* If the conversion failed, treat this just like `return;'. */
6045 if (retval == error_mark_node)
6047 /* We can't initialize a register from a AGGR_INIT_EXPR. */
6048 else if (! current_function_returns_struct
6049 && TREE_CODE (retval) == TARGET_EXPR
6050 && TREE_CODE (TREE_OPERAND (retval, 1)) == AGGR_INIT_EXPR)
6051 retval = build (COMPOUND_EXPR, TREE_TYPE (retval), retval,
6052 TREE_OPERAND (retval, 0));
6054 maybe_warn_about_returning_address_of_local (retval);
6057 /* Actually copy the value returned into the appropriate location. */
6058 if (retval && retval != result)
6059 retval = build (INIT_EXPR, TREE_TYPE (result), result, retval);
6065 /* Returns nonzero if the pointer-type FROM can be converted to the
6066 pointer-type TO via a qualification conversion. If CONSTP is -1,
6067 then we return nonzero if the pointers are similar, and the
6068 cv-qualification signature of FROM is a proper subset of that of TO.
6070 If CONSTP is positive, then all outer pointers have been
6074 comp_ptr_ttypes_real (tree to, tree from, int constp)
6076 bool to_more_cv_qualified = false;
6078 for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from))
6080 if (TREE_CODE (to) != TREE_CODE (from))
6083 if (TREE_CODE (from) == OFFSET_TYPE
6084 && !same_type_p (TYPE_OFFSET_BASETYPE (from),
6085 TYPE_OFFSET_BASETYPE (to)))
6088 /* Const and volatile mean something different for function types,
6089 so the usual checks are not appropriate. */
6090 if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE)
6092 if (!at_least_as_qualified_p (to, from))
6095 if (!at_least_as_qualified_p (from, to))
6099 to_more_cv_qualified = true;
6103 constp &= TYPE_READONLY (to);
6106 if (TREE_CODE (to) != POINTER_TYPE && !TYPE_PTRMEM_P (to))
6107 return ((constp >= 0 || to_more_cv_qualified)
6108 && same_type_ignoring_top_level_qualifiers_p (to, from));
6112 /* When comparing, say, char ** to char const **, this function takes
6113 the 'char *' and 'char const *'. Do not pass non-pointer/reference
6114 types to this function. */
6117 comp_ptr_ttypes (tree to, tree from)
6119 return comp_ptr_ttypes_real (to, from, 1);
6122 /* Returns 1 if to and from are (possibly multi-level) pointers to the same
6123 type or inheritance-related types, regardless of cv-quals. */
6126 ptr_reasonably_similar (tree to, tree from)
6128 for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from))
6130 /* Any target type is similar enough to void. */
6131 if (TREE_CODE (to) == VOID_TYPE
6132 || TREE_CODE (from) == VOID_TYPE)
6135 if (TREE_CODE (to) != TREE_CODE (from))
6138 if (TREE_CODE (from) == OFFSET_TYPE
6139 && comptypes (TYPE_OFFSET_BASETYPE (to),
6140 TYPE_OFFSET_BASETYPE (from),
6141 COMPARE_BASE | COMPARE_DERIVED))
6144 if (TREE_CODE (to) == INTEGER_TYPE
6145 && TYPE_PRECISION (to) == TYPE_PRECISION (from))
6148 if (TREE_CODE (to) == FUNCTION_TYPE)
6151 if (TREE_CODE (to) != POINTER_TYPE)
6153 (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from),
6154 COMPARE_BASE | COMPARE_DERIVED);
6158 /* Like comp_ptr_ttypes, for const_cast. */
6161 comp_ptr_ttypes_const (tree to, tree from)
6163 for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from))
6165 if (TREE_CODE (to) != TREE_CODE (from))
6168 if (TREE_CODE (from) == OFFSET_TYPE
6169 && same_type_p (TYPE_OFFSET_BASETYPE (from),
6170 TYPE_OFFSET_BASETYPE (to)))
6173 if (TREE_CODE (to) != POINTER_TYPE)
6174 return same_type_ignoring_top_level_qualifiers_p (to, from);
6178 /* Returns the type qualifiers for this type, including the qualifiers on the
6179 elements for an array type. */
6182 cp_type_quals (tree type)
6184 type = strip_array_types (type);
6185 if (type == error_mark_node)
6186 return TYPE_UNQUALIFIED;
6187 return TYPE_QUALS (type);
6190 /* Returns nonzero if the TYPE contains a mutable member */
6193 cp_has_mutable_p (tree type)
6195 type = strip_array_types (type);
6197 return CLASS_TYPE_P (type) && CLASSTYPE_HAS_MUTABLE (type);
6200 /* Subroutine of casts_away_constness. Make T1 and T2 point at
6201 exemplar types such that casting T1 to T2 is casting away castness
6202 if and only if there is no implicit conversion from T1 to T2. */
6205 casts_away_constness_r (tree *t1, tree *t2)
6210 /* [expr.const.cast]
6212 For multi-level pointer to members and multi-level mixed pointers
6213 and pointers to members (conv.qual), the "member" aspect of a
6214 pointer to member level is ignored when determining if a const
6215 cv-qualifier has been cast away. */
6216 if (TYPE_PTRMEM_P (*t1))
6217 *t1 = build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (*t1));
6218 if (TYPE_PTRMEM_P (*t2))
6219 *t2 = build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (*t2));
6221 /* [expr.const.cast]
6223 For two pointer types:
6225 X1 is T1cv1,1 * ... cv1,N * where T1 is not a pointer type
6226 X2 is T2cv2,1 * ... cv2,M * where T2 is not a pointer type
6229 casting from X1 to X2 casts away constness if, for a non-pointer
6230 type T there does not exist an implicit conversion (clause
6233 Tcv1,(N-K+1) * cv1,(N-K+2) * ... cv1,N *
6237 Tcv2,(M-K+1) * cv2,(M-K+2) * ... cv2,M *. */
6239 if (TREE_CODE (*t1) != POINTER_TYPE
6240 || TREE_CODE (*t2) != POINTER_TYPE)
6242 *t1 = cp_build_qualified_type (void_type_node,
6243 cp_type_quals (*t1));
6244 *t2 = cp_build_qualified_type (void_type_node,
6245 cp_type_quals (*t2));
6249 quals1 = cp_type_quals (*t1);
6250 quals2 = cp_type_quals (*t2);
6251 *t1 = TREE_TYPE (*t1);
6252 *t2 = TREE_TYPE (*t2);
6253 casts_away_constness_r (t1, t2);
6254 *t1 = build_pointer_type (*t1);
6255 *t2 = build_pointer_type (*t2);
6256 *t1 = cp_build_qualified_type (*t1, quals1);
6257 *t2 = cp_build_qualified_type (*t2, quals2);
6260 /* Returns nonzero if casting from TYPE1 to TYPE2 casts away
6264 casts_away_constness (tree t1, tree t2)
6266 if (TREE_CODE (t2) == REFERENCE_TYPE)
6268 /* [expr.const.cast]
6270 Casting from an lvalue of type T1 to an lvalue of type T2
6271 using a reference cast casts away constness if a cast from an
6272 rvalue of type "pointer to T1" to the type "pointer to T2"
6273 casts away constness. */
6274 t1 = (TREE_CODE (t1) == REFERENCE_TYPE ? TREE_TYPE (t1) : t1);
6275 return casts_away_constness (build_pointer_type (t1),
6276 build_pointer_type (TREE_TYPE (t2)));
6279 if (TYPE_PTRMEM_P (t1) && TYPE_PTRMEM_P (t2))
6280 /* [expr.const.cast]
6282 Casting from an rvalue of type "pointer to data member of X
6283 of type T1" to the type "pointer to data member of Y of type
6284 T2" casts away constness if a cast from an rvalue of type
6285 "pointer to T1" to the type "pointer to T2" casts away
6287 return casts_away_constness
6288 (build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t1)),
6289 build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t2)));
6291 /* Casting away constness is only something that makes sense for
6292 pointer or reference types. */
6293 if (TREE_CODE (t1) != POINTER_TYPE
6294 || TREE_CODE (t2) != POINTER_TYPE)
6297 /* Top-level qualifiers don't matter. */
6298 t1 = TYPE_MAIN_VARIANT (t1);
6299 t2 = TYPE_MAIN_VARIANT (t2);
6300 casts_away_constness_r (&t1, &t2);
6301 if (!can_convert (t2, t1))
6307 /* If T is a REFERENCE_TYPE return the type to which T refers.
6308 Otherwise, return T itself. */
6311 non_reference (tree t)
6313 if (TREE_CODE (t) == REFERENCE_TYPE)